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Eagle has the longest life-span of its species.Eagle can (1)up to 70 years, but to reach age, the eagle must make a hard Decision.In its 40’s, its long and flexible talons can no longer grab grey which serve as food, its long and sharp beak becomes bent.I

题目

Eagle has the longest life-span of its species.Eagle can (1)up to 70 years, but to reach age, the eagle must make a hard Decision.

In its 40’s, its long and flexible talons can no longer grab grey which serve as food, its long and sharp beak becomes bent.Its old-aged and heavy wings, due to their thick feathers.become stuck to its chest and make it (2)to fly.Then eagle is left with only two options: die or go through a painful process of change which lasts 150 days for survival

The process requires that eagle fly to a mountain top and sit on its nest"here the eagle knocks its beak (3)a rock until it plucks it out.After plucking it out, eagle will wait for a new beak to grow back.When its new talons grow back, the eagle starts plucking its old-aged features and after five months eagle can take its flight to rebirth and lives for thirty (4) years.

Many times, in order to survive, we have to start a change process.We sometimes need to(5) old memories, habits and other past traditions.Only freed from past burdens, can we take advantage of the present(完型填空)

A.Against

B.Difficult

C.Get rid of

D.Live

E.Mor


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  • 第1题:

    变直径圆管流,细断面直径d1,粗断面直径d2=2d1,粗细断面雷诺数的关系是:

    A. Re1=0. 5Re2
    B. Re1 =1. 5Re2
    C. Re1=Re2
    D. Re1 =2Re2

    答案:D
    解析:

  • 第2题:

    变直径管流细断面直径为d1,粗断面直径d2=2d1,粗细断面雷诺系数的关系是(  )。

    A.Re1=0.5Re2
    B.Re1=Re2
    C.Re1=1.5Re2
    D.Re1=2Re2

    答案:D
    解析:
    用圆管传输流体计算雷诺数时,定型尺寸一般取管道直径(d),则雷诺数Re=vdρ/μ,而v=Q/A=4Q/πd2,换算得:

    又d2=2d1,所以Re1=2Re2。

  • 第3题:

    同一管道中,分别用Re1、Re2、Re3表示紊流、临界、层流时的雷诺数,那么三者的正确关系是()。

    A.Re1<Re2<Re3

    B.Re1=Re2=Re3

    C.Re1>Re2>Re3

    D.Re2<Re3<Re1


    Re紊流> Re临界> Re层流

  • 第4题:

    Of the reptile groups,the snake group was the final one to appear.

    A:last
    B:best
    C:ugliest
    D:longest

    答案:A
    解析:
    本句意思:蛇类是爬行动物中最晚出现的。final最终的,最后的。last最后的;best最好的;ugliest最丑的;longest最长的。

  • 第5题:

    1、在选择汽车最小传动比时,为了追求燃油经济性,哪种设计方式最好:

    A.uamax/uP > 1

    B.uamax/uP = 1

    C.uamax/uP < 1

    D.uamax/uP = 0


    u amax / u P < 1

  • 第6题:

    真核生物ITS序列由ITS1和ITS2两部分组成。


    编码序列