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单选题Animals, which are nevertheless displaying some extremely different physiological and behavioral traits, are genetically similar.A Animals, which are nevertheless displaying some extremely different physiological and behavioral traits, are genetically

题目
单选题
Animals, which are nevertheless displaying some extremely different physiological and behavioral traits, are genetically similar.
A

Animals, which are nevertheless displaying some extremely different physiological and behavioral traits, are genetically similar.

B

Though genetically similar, animals, nevertheless, display some extremely different physiological and behavioral traits.

C

Some animals that are genetically similar nevertheless display extremely different physiological and behavioral traits.

D

Some animals display extremely different physiological and behavioral traits, they are genetically similar, nevertheless.

E

Some animals display extremely different physiological and behavioral traits and are genetically similar.


相似考题

3.Most animals have little connection with animals of different kind, unless they hunt them for food. Sometimes, however, two kinds of animals come together in a partnership ( 伙伴关系 ) which does good to both of them. You may have noticed some birds sitting on the backs of sheep. This is not because they want a ride, but because they find easy food in the parasites (寄生虫 ) on sheep. The sheep allow the birds to do so because they remove the cause of discomfort. So although they can manage without each other, they do better together.Sometimes an animal has a plant partner. The relationship develops until the two partners cannot manage without each other. This is so in the corals ( 珊瑚 ) of the sea. In their skins they have tiny plants act as "dustman", taking some of the waste products form. the corals and giving in return oxygen which the animal needs to breathe. If the plants are killed, or are ever prevented from lighting so that they cannot live normally, the corals will die.1、Some birds like to sit on a sheep because ( ).A、they can eat its parasitesB、 they depend on the sheep for existenceC、 they enjoy traveling with the sheepD、 they find the position most comfortable2、The underlined word "they" in the last sentence of the first paragraph refers to ( ).A、birds and parasitesB、birds and sheepC、parasites and sheepD、sheep, birds and parasites3、What does the second paragraph mainly discuss? ( )A、Some animals and plants depend on each other for existence.B、 Some animals and plants develop their relationship easily.C、 Some plants depend on each other for fooD、 Some animals live better together.4、What does this article talk about? ( )A、Two kinds of animals for a partnership.B、Most animals only have connection with animals.C、The connection between the living things.D、Corals have some connection with plants.

更多“单选题Animals, which are nevertheless displaying some extremely different physiological and behavioral traits, are genetically similar.A Animals, which are nevertheless displaying some extremely different physiological and behavioral traits, are genetically ”相关问题
  • 第1题:

    A letter to the president exposed the corruption of some managers in his firm; ______ they got fired.

    A:constantly

    B:consequently

    C:thereafter

    D:nevertheless


    正确答案:B 

  • 第2题:

    Some of these shoals have been disproved and are not charted. Nevertheless mariners should ________ with particular caution in this area.

    A.go

    B.proceed

    C.move

    D.remove


    正确答案:B

  • 第3题:

    It should go without saying that the focus of UML is modeling.However,what that means,exactly,can be an open-ended question.( )is a means to capture ideas,relationships,decisions,and requirements in a well-defined notation that can be applied to many different domains.Modeling not only means different things to different people,but also it can use different pieces of UML depending on what you are trying to convey.In general,a UML model is made up of one or more( ).A diagram graphically represents things,and the relationships between these things.These( )can be representations of real-world objects,pure software constructs,or a description of the behavior of some other objects.It is common for an individual thing to show up on multiple diagrams;each diagram represents a particular interest,or view,of the thing being modeled.UML 2.0 divides diagrams into two categories:structural diagrams and behavioral diagrams.( )are used to capture the physical organization of the things in your system,i.e.,how one object relates to another.(请作答此空)focus on the behavior of elements in a system.For example,you can use behavioral diagrams to capture requirements,operations,and internal state changes for elements.

    A.Activity diagrams
    B.Use-case diagrams
    C.Structural diagrams
    D.Behavioral diagrams

    答案:D
    解析:
    UML的核心关注内容是建模。然而建模是一个开放性的问题。建模是采用合适并预先定义的符号来描述捕获的思想、关系、决策和需求,并且建模可应用到多个领域。建模对不同的人有不同的含义,可以使用UML中不同的部分来描述你所要涵盖的内容。一般来说,UML模型是由一个或者多个diagram组成。一个diagram使用图形化的方式描述了事物以及事物之间的关系,而事物代表了真实世界中的对象、软件构件或对象行为。常常一个独立的事物会在多个diagram中展现,每个diagram建模了该事物的不同方面。UML 2.0将diagram分为两大类:结构化diagram和行为diagram。结构化diagram主要用于捕获系统的物理组织结构,如一个对象与其他对象的关系。行为diagram则用于捕获需求、操作以及元素内部状态的变化。

  • 第4题:

    Can animals be made to work for us?Some scientists think that one day animals may be trained to do a number of simple jobs that are now done by human beings.
    They point out that at a circus,for example,we may see elephants,monkeys,dogs and other animals doing quite skillful things.Perhaps you have seen them on the television or in a film.If you watch closely,you may notice that the trainer always gives the animal a piece of candy or a piece of fruit as a reward.The scientists say that many different animals may be trained to do a number of simple jobs if they know they will get a reward for doing them.
    Of course,as we know,dogs can be used to guard a house,and soldiers in both old and modem times have used geese to give warning by making a lot of noise when a stranger or an enemy comes near.But it may be possible to train animals to work in factories.In Russia,for example,pigeons which are birds with good eyesight,are being used to watch out for faults in small steel balls that are being made in one factory.When the pigeon sees a ball which looks different from others,it touches a steel plate with its beak.This turns on a light to warn people in the factory.At the same time a few seeds are given as a reward.It takes three to five weeks to train a pigeon to do this and one pigeon can inspect 3 000 to 4 000 balls an hour.
    Apes have been used in America in helping to make cars,and scientists believe that these large monkeys may be one day gather crops and even drive trains.

    Which of the following is not true?

    A.Scientists consider apes may drive trains some da
    B.Apes have worked in some factorie
    C.Apes may one day be used to gather crop
    D.An ape is not a large monke

    答案:D
    解析:
    文中最后一段中large monkeys就指apes。

  • 第5题:

    Can animals be made to work for us?Some scientists think that one day animals may be trained?to do a number of simple jobs that are now done by human beings.
    They point out that at a circus,for example,we may see elephants,monkeys,dogs and other ani-mals doing quite skillful things.Perhaps you have seen them on the television or in a film.If you?watch closely,you may notice that the trainer always gives the animal a piece of candy or a piece of?fruit as a reward.The scientists say that many different animals may be trained to do a number of?simple jobs if they know they will get a reward for doing them.
    Of course,as we know,dogs can be used to guard a house,and soldiers in both old and modern?times have used geese to give warning by making a lot of noise when a stranger or an enemy comes?near.But it may be possible to train animals to work in factories.In Russia,for example,pigeons?which are birds with good eyesight,are being nsed to watch out for faults in small steel balls that are?being made in one factory.When the pigeon sees a ball which looks different from others,it touches a?steel plate with its beak.This turns on a light to warn people in the factory.At the same time a few?seeds are given as a reward.It takes three to five weeks to train a pigeon to do this and one pigeon?can inspect 3,000 to 4,000 balls an hour.
    Apes have been used in America in helping to make cars,and scientists believe that these large?monkeys may be one day gather crops and even drive trains.

    What made scientists think animal can be made to work for us one day?

    A.Animals are very skillful at a circus.
    B.They are big and strong.
    C.Some animals are as clever as human beings.
    D.Animals carl be trained because they like to get something as a reward.

    答案:A
    解析:
    由第二段第一句“They point out that at a cir-cus,for example,we may see elephants,monkeys,dogs and?other animals doing quite skillful things.”可知句中they指的就是scientists。

  • 第6题:

    遗传工程动物(Genetically engineered Animals)


    正确答案: 是指将外源基因或经改造的自身基因片段导入动物受精卵或早期胚胎,使之稳定整合于宿主的染色体基因组内,并能遗传给后代的一类动物。

  • 第7题:

    Bridges and switches are Layer 2 devices that provide the same basic functionality but that also have some differences. Which two traits apply to switches only?()

    • A、 supports Layer 2 VLANs
    • B、 segment LANs
    • C、 are faster because forwarding decisions are made on hardware
    • D、 typically have fewer ports because forwarding decisions are made in software
    • E、 flood frames out all ports

    正确答案:A,C

  • 第8题:

    单选题
    In the last part of the passage, the sentence “Food for animals is often seasonal, always expensive” means food for animals if often ______.
    A

    different and expensive in different seasons

    B

    similar and expensive in different season

    C

    seasoned and expensive

    D

    eaten with spices and thus expensive


    正确答案: B
    解析:
    seasonal意为“季节性的,依照季节的”,故此处的意思是“动物饲料常常随着季节而变化,而且总是价格昂贵”。A项为正确答案。

  • 第9题:

    单选题
    Some children want to challenge themselves by learning a language different from which their parents speak at home.
    A

    want to

    B

    themselves

    C

    which

    D

    at home


    正确答案: B
    解析:

  • 第10题:

    单选题
    Which of the following statements is closest in meaning to that expressed in the passage?
    A

    There are very few technologies that are currently held as controversial.

    B

    Critics object to genetically modified (GM) crops grown in many different countries in Europe.

    C

    A main objection against GM food is that it is not naturally produced.

    D

    The transportation of such crops across the Spanish borders is difficult.


    正确答案: C
    解析:
    该段录音主要描述转基因作物备受争议,其中批评者普遍给出的一个原因是“they are unnatural”,对应选项C。
    【录音原文】
    Few technologies are currently as controversial as genetically modified (GM) crops. Critics, particularly in Europe, object to them on many grounds. A common objection is that they are unnatural, because they often involve the transplantation of genes from entirely different species.

  • 第11题:

    单选题
    The food we eat seems to have profound effects on our health.Although science has made enormous steps in making food more fit to eat ,it has, at the same time,made many foods unfit to eat. Some research has shown that perhaps eighty percent of all human illnesses are related to diet and forty percent of cancer is related to the diet as well,especially cancer of the colon. Different cultures are more likely to cause certain different illnesses because of the food that is characteristic in these cultures. That food is related to illness is nto a new discovery. In 1945, about 35 years ago, government researchers realized that nitrates, commonly used to preserve color in meats,and other food additives,caused cancer. Yet, these carcinogenic additives remain in our food, and it becomes more difficult all the time to know which things on the packaging labels of processed food are helpful or harmful. The additives which we eat are not all so direct. Farmers often give penicillin to beef and living animals, and because of this ,penicillin has been found in the milk of treated cow. Sometimes similar drugs are given to animals not for medical purposes,but for financial reasons. The farmers are simply trying to fatten the animals in order to obtain a higher price on the market. Although the Food and Drug Administration(FDA) has tried repeatedly to control these procedures, the practices continue. Which of the following statements is NOT ture?()
    A

    Drugs are always given to animals for medical reasons

    B

    Some of the additives in our food are added to the food itself and some are given to the living animals

    C

    Researchers have known about the potential dangers of food additives for over thirty-five years.

    D

    Food may cause forty percent of cancer in world.


    正确答案: D
    解析: 暂无解析

  • 第12题:

    单选题
    A new computer is displaying the wrong amount of memory. Which of the following may be the cause?()
    A

    The module is installed backwards.

    B

    A USB device is using some memory.

    C

    An onboard video card is using some memory.

    D

    The CPU is using some memory.


    正确答案: C
    解析: 暂无解析

  • 第13题:

    According to the passage,which of the following is true? ( )

    A. Tell the truth,even when you are wrong.

    B. Keep some animals to kill them.

    C.Look down on new ideas.

    D. Everything on the Internet is good for children.


    正确答案:A
    A[解析]A选项说哪怕做错事也要讲实话,符合第一条规则,要做个诚实的学生。B选项说养几只动物后杀了它们,不符合第二条规则中保护动物的要求。C选项说轻视新想法,不符合第三条规则中的“Don't look down on new ideas”。D选项说互联网上所有的内容都对孩子有好处,不符合第五条规则说的要选择适合孩子看的网页。所以答案选A。

  • 第14题:

    The food we eat seems to have profound effects on our health.Although science has made enormous steps in making food more fit to eat ,it has, at the same time,made many foods unfit to eat. Some research has shown that perhaps eighty percent of all human illnesses are related to diet and forty percent of cancer is related to the diet as well,especially cancer of the colon. Different cultures are more likely to cause certain different illnesses because of the food that is characteristic in these cultures. That food is related to illness is nto a new discovery. In 1945, about 35 years ago, government researchers realized that nitrates, commonly used to preserve color in meats,and other food additives,caused cancer. Yet, these carcinogenic additives remain in our food, and it becomes more difficult all the time to know which things on the packaging labels of processed food are helpful or harmful. The additives which we eat are not all so direct. Farmers often give penicillin to beef and living animals, and because of this ,penicillin has been found in the milk of treated cow. Sometimes similar drugs are given to animals not for medical purposes,but for financial reasons. The farmers are simply trying to fatten the animals in order to obtain a higher price on the market. Although the Food and Drug Administration(FDA) has tried repeatedly to control these procedures, the practices continue.
    Which of the following statements is NOT ture?

    a.Drugs are always given to animals for medical reasons
    b.Some of the additives in our food are added to the food itself and some are given to the living animals
    c.Researchers have known about the potential dangers of food additives for over thirty-five years.
    d.Food may cause forty percent of cancer in world.

    答案:A
    解析:

  • 第15题:

    Can animals be made to work for us?Some scientists think that one day animals may be trained to do a number of simple jobs that are now done by human beings.
    They point out that at a circus,for example,we may see elephants,monkeys,dogs and other animals doing quite skillful things.Perhaps you have seen them on the television or in a film.If you watch closely,you may notice that the trainer always gives the animal a piece of candy or a piece of fruit as a reward.The scientists say that many different animals may be trained to do a number of simple jobs if they know they will get a reward for doing them.
    Of course,as we know,dogs can be used to guard a house,and soldiers in both old and modem times have used geese to give warning by making a lot of noise when a stranger or an enemy comes near.But it may be possible to train animals to work in factories.In Russia,for example,pigeons which are birds with good eyesight,are being used to watch out for faults in small steel balls that are being made in one factory.When the pigeon sees a ball which looks different from others,it touches a steel plate with its beak.This turns on a light to warn people in the factory.At the same time a few seeds are given as a reward.It takes three to five weeks to train a pigeon to do this and one pigeon can inspect 3 000 to 4 000 balls an hour.
    Apes have been used in America in helping to make cars,and scientists believe that these large monkeys may be one day gather crops and even drive trains.

    What made scientists think animal can be made to work for us one day?

    A.Animals are very skillful at a circu
    B.They are big and stron
    C.Some animals are as clever as human being
    D.Animals can be trained because they like to get something as a rewar

    答案:A
    解析:
    参见句子:They point out that at a circus,for example,we may see elephants,monkeys,dogs and other animals doing quite skillful things.句中they指的就是scientists。

  • 第16题:

    Can animals be made to work for us?Some scientists think that one day animals may be trained?to do a number of simple jobs that are now done by human beings.
    They point out that at a circus,for example,we may see elephants,monkeys,dogs and other ani-mals doing quite skillful things.Perhaps you have seen them on the television or in a film.If you?watch closely,you may notice that the trainer always gives the animal a piece of candy or a piece of?fruit as a reward.The scientists say that many different animals may be trained to do a number of?simple jobs if they know they will get a reward for doing them.
    Of course,as we know,dogs can be used to guard a house,and soldiers in both old and modern?times have used geese to give warning by making a lot of noise when a stranger or an enemy comes?near.But it may be possible to train animals to work in factories.In Russia,for example,pigeons?which are birds with good eyesight,are being nsed to watch out for faults in small steel balls that are?being made in one factory.When the pigeon sees a ball which looks different from others,it touches a?steel plate with its beak.This turns on a light to warn people in the factory.At the same time a few?seeds are given as a reward.It takes three to five weeks to train a pigeon to do this and one pigeon?can inspect 3,000 to 4,000 balls an hour.
    Apes have been used in America in helping to make cars,and scientists believe that these large?monkeys may be one day gather crops and even drive trains.

    Which of the following is NOT true?

    A.Scientists consider apes may drive trains some day.
    B.Apes have worked in some factories.
    C.Apes may one day be used to gather crops.
    D.An ape is not a large monkey.

    答案:D
    解析:
    文中最后一段中large monkeys就是指apes。

  • 第17题:

    A new computer is displaying the wrong amount of memory. Which of the following may be the cause?()

    • A、The module is installed backwards.
    • B、A USB device is using some memory.
    • C、An onboard video card is using some memory.
    • D、The CPU is using some memory.

    正确答案:C

  • 第18题:

    The food we eat seems to have profound effects on our health.Although science has made enormous steps in making food more fit to eat ,it has, at the same time,made many foods unfit to eat. Some research has shown that perhaps eighty percent of all human illnesses are related to diet and forty percent of cancer is related to the diet as well,especially cancer of the colon. Different cultures are more likely to cause certain different illnesses because of the food that is characteristic in these cultures. That food is related to illness is nto a new discovery. In 1945, about 35 years ago, government researchers realized that nitrates, commonly used to preserve color in meats,and other food additives,caused cancer. Yet, these carcinogenic additives remain in our food, and it becomes more difficult all the time to know which things on the packaging labels of processed food are helpful or harmful. The additives which we eat are not all so direct. Farmers often give penicillin to beef and living animals, and because of this ,penicillin has been found in the milk of treated cow. Sometimes similar drugs are given to animals not for medical purposes,but for financial reasons. The farmers are simply trying to fatten the animals in order to obtain a higher price on the market. Although the Food and Drug Administration(FDA) has tried repeatedly to control these procedures, the practices continue. Which of the following statements is NOT ture?()

    • A、Drugs are always given to animals for medical reasons
    • B、Some of the additives in our food are added to the food itself and some are given to the living animals
    • C、Researchers have known about the potential dangers of food additives for over thirty-five years.
    • D、Food may cause forty percent of cancer in world.

    正确答案:A

  • 第19题:

    单选题
    Some animals can _____ in the desert on very little water.
    A

    survive

    B

    starve

    C

    relieve

    D

    routine


    正确答案: B
    解析:

  • 第20题:

    单选题
    Animals, which are nevertheless displaying some extremely different physiological and behavioral traits, are genetically similar.
    A

    Animals, which are nevertheless displaying some extremely different physiological and behavioral traits, are genetically similar.

    B

    Though genetically similar, animals, nevertheless, display some extremely different physiological and behavioral traits.

    C

    Some animals that are genetically similar nevertheless display extremely different physiological and behavioral traits.

    D

    Some animals display extremely different physiological and behavioral traits, they are genetically similar, nevertheless.

    E

    Some animals display extremely different physiological and behavioral traits and are genetically similar.


    正确答案: B
    解析:
    A项改变了句子原来的意思且讲不通。B项也是同样的错误。B项累赘。D项不符合逻辑。E项错用“and”连接句子前后形成对比的分句,只有C项正确。

  • 第21题:

    单选题
    Some people argue that it would do more harm than good for plants and animals to develop through artificial selection. Which statement best supports this argument?
    A

    Roses no longer smell like roses.

    B

    Purebred dogs are disappearing.

    C

    Humans are harmful agents of plant and animal evolution.

    D

    Many domesticated plants and animals can no longer survive in the wild.


    正确答案: C
    解析:
    题干中指出一些人认为人工选择植物和动物对它们发展造成的危害要大于益处,问文中那个陈述可以支撑这一论点。文章第二段指出人们通过人工选择来使植物或动物进行繁殖,而很多栽培植物和驯化动物在野外已无法生存,因此符合题意。其他选项在文中均未提及。

  • 第22题:

    单选题
    Most animals have little connection with _____ animals of _____ different kind unless they kill them for food.
    A

    the: /

    B

    /; a

    C

    the; the

    D

    /; /


    正确答案: B
    解析:
    句意:大多数动物和其他种类的动物联系很少,除非它们捕杀其作为食物。animals在这里是泛指,可直直接用复数名词,所以不加冠词。of a different kind是固定词组,泛指任一“不同一类的”。故本题应选B。

  • 第23题:

    问答题
    Practice 2  Transgenic plants and animals result from genetic engineering experiments in which genetic material is moved from one organism to another, so that the latter will exhibit a characteristic. Business corporations, scientists, and farmers hope that transgenic techniques will allow more cost-effective and precise plants and animals with desirable characteristics that are not available using up to date breeding technology.  Transgenic techniques allow genetic material to be transferred between completely unrelated organisms.  In order for a transgenic technique to work, the genetic engineer must first construct a transgene, which is the gene to be introduced plus a control sequence. When making a transgene, scientists usually substitute the original promoter sequence with one that will be active in the correct tissues of the recipient plant or animal.  The creation of transgenic animals is one of the most dramatic advances derived from recombinant DNA technology. A transgenic animal results from insertion of a foreign gene into an embryo.  The foreign gene becomes a permanent part of the host animals’ genetic material. As the embryo develops, the foreign gene may be present in many cells of the body, including the germ cells of the testis or the ovary. If the transgenic animal is fertile, the inserted foreign gene (transgene) will be inherited by future progeny. Thus, a transgenic animal, once created, can persist into future generations. Transgenic animals are different from animals in which foreign cells or foreign organs have been engrafted. The progeny of engrafted animals do not inherit the experimental change. The progeny of transgenic animals do.  The techniques for creating a transgenic animal include the following: 1) picking a foreign gene, 2) placing the foreign gene in a suitable form called a “construct” which guides the insertion of the foreign gene into the animal genome and encourages its expression, and 3) injecting the construct into a single fertilized egg or at the very early embryo stage of the host animal. Much genetic engineering goes into the choice of a foreign gene and building a construct. The construct must have promoters to turn on foreign gene expression at its new site within the host animal genome. By choosing a particular promoter and splicing it in front of the foreign gene, we can encourage expression of our transgene within a specific tissue.  One of the most important applications of transgenic animals is the development of new animal models of human disease. Transgenic animals can serve as models for many malignant tumors. Mice have been the most frequent hosts for transgenic modification, other domestic animals have also been used. One idea has been to create transgenic cows which secrete important pharmaceutical substances in their milk. Other attempts are being made to express human interferon in the milk of sheep.  A transgenic crop plant contains a gene or genes which have been artificially inserted instead of the plant acquiring them through pollination. The inserted gene sequence (known as the transgene) may come from another unrelated plant, or from a completely different species: transgenic BT corn, for example, which produces its own insecticide, containing a gene from a bacterium. Plants containing transgenes are often called genetically modified or GM crops although in reality all crops have been genetically modified from their original wild state by domestication, selection and controlled breeding over long periods of time.

    正确答案: 参考译文
    转基因动植物系遗传工程实验的产物,在这个实验中,一个生物体的遗传物质被移入另一个生物体内,因而后者就能显示出新的特征。商界、科学家和农民都希望转基因技术能够培育出更具价格优势、而且是最近的培育技术无法培育的恰遂人愿的动植物。转基因技术能使遗传物质在两种完全不相干的生物体之间进行转移。
    为了启用转基因技术,基因工程师必须首先培育一个转基因,转基因即含有受控序列的用于移植的基因。在培育转基因时,科学家通常用一个将在受体动物或植物的恰当组织中活动的启动子序列替代原有的启动子序列。
    转基因动物的问世是重组DNA技术最激动人心的进展之一。把异体基因植入胚胎后即培育出转基因动物。这样异体基因就永远地成了宿主动物基因物质的一部分。随着胚胎的发育,异体基因有可能进入身体的许多细胞中,包括睾丸或卵巢的生殖细胞。如果转基因动物具有繁殖能力,植入的异体基因(转基因)就会遗传给下一代。因此,转基因动物一经培育成功,就能世代相传。转基因动物与植入异体细胞或异体器官的动物不一样。植入异体细胞或异体器官的动物发生的实验性变异不会遗传给下一代,而转基因动物的后代会继承转基因引起的变异。
    转基因动物的培育主要采用以下的技术手段:1)选取一个异体基因,2)把异体基因置于某个合适的“结构体”(译者注:专业术语称plasmid,汉译“质粒”)中,这个结构体能把异体基因导入动物的基因组并能激活基因显现,3)把结构体注入宿主动物的一个单独的受精卵内或宿主动物的发育刚起步的胚胎中。基因工程的重头戏在于选择异体基因和培育结构体。这个结构体必须要有启动子,并靠启动子激活异体基因在宿主动物基因组的新部位上的基因显现。通过选择某个特别的启动子并把它粘接在异体基因表面,就能在某个特别的组织内激发转基因显现。
    转基因动物最为重要的用途之一是开发培育出罹患人类疾病的新型动物。转基因动物可以用来培育罹患多种人类的恶性肿瘤的“模特儿”,老鼠是最常见的用于基因改造的宿主动物,当然还有别的家畜。人们设想培育一种转基因奶牛,能分泌出含有珍贵药物成分的牛奶,此外,人们正在尝试使羊奶中含有人类干扰素。
    转基因植物内有一个或多个基因由人工导入,而并非通过天然授粉获得。导入的基因序列(即转基因)可能源于另一种与之毫不相干的植物,甚至会来自于完全不同的物种。例如,转基因Bt玉米就含有某种细菌的基因,能自身产生杀虫物质。体内含有转基因的植物常常称为遗传修饰过的作物,或GM作物,尽管事实上所有的农作物都是由最初的野生状态经过漫长岁月的驯化、优选和调控性育种使其基因得以改良。
    解析: 暂无解析

  • 第24题:

    单选题
    Some of these shoals have been disproved and are not charted. Nevertheless mariners should ()with particular caution in this area.
    A

    go

    B

    proceed

    C

    move

    D

    remove


    正确答案: C
    解析: 暂无解析