The fiddler crab (蟹) is a living clock. It shows the time of day by the colour of its skin, which is dark by day and pale by night. The crab’s changing colour follows a regular twenty—four hour plan that exactly matches the daily rhythm of the sun.
Does the crab actually keep time, or does its skin simply answer to the sun’s rays, changing colour according to the amount of light strikes it? To find out, biologists kept crabs in a dark room for two months. Even without daylight, the crab’s skin colour continued to change exactly on time.
This characteristic probably developed gradually in answer to the daily rising and setting of the sun, to help protect the crab from sunlight and enemies. After millions of years it has become completely regulated (受控制) inside the living body of the crab.
The biologists noticed that once each day the colour of the fiddler crab is especially dark, and that each day this happens fifty minutes later than on the day before. From this they discovered that each crab follows not only the rhythm of the sun but also that of the tides (潮水). The crab’s period of greatest darkening is exactly the time of low tide on the beach where it was caught!
【小題1】The fiddler crab is like a clock because it changes colour ______.
A in a regular 24—hour rhythm              B. in answer to the sun’s rays
C. at low tide                            D. every fifty minutes
【小題2】The crab’s changing colour ______.

A．tells the crab what time it isB．protects the crab from the sunlight and enemies
C．keeps the crab warmD．is of no real use
【小題3】 When the fiddler crabs were kept in the dark , they ______.
A．did not change colourB．changed colour more quickly
C．changed colour more slowlyD．changed colour on the same timetable
【小題4】The crab’s colour—changing ability was probably developed ______.
A．in the process of evolution (進(jìn)化)B．over millions of years
C．by the work of biologistsD．both A and B
【小題5】The best title for this selection would be ______.
A．The Sun and the TidesB．Discoveries in Biology
C．A scientific StudyD．A Living Clock


【小題1】A
【小題1】B
【小題1】D
【小題1】D
【小題1】D

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  1. 1.

    After attending Rooster Morris’ performances, kids _____

    1. A.
      are asked to write an article
    2. B.
      are able to play an instrument
    3. C.
      are well prepared to start school
    4. D.
      become more confident about themselves
  2. 2.

    What does Rooster Morris do during his performances?
    ① Read books.
    ② Play an instrument.
    ③ Give out books.
    ④ Teach the audience how to draw.
    ⑤ Perform a play

    1. A.
      ①②
    2. B.
      ①③
    3. C.
      ③④
    4. D.
      ②⑤
  3. 3.

    Rooster talks about how he learnt to play the fiddle in order to prove that _________．

    1. A.
      writing needs creativity
    2. B.
      forming good habits is important
    3. C.
      learning to play an instrument is not easy
    4. D.
      people should take action to achieve their goals
  4. 4.

    The main purpose of the passage is to            .

    1. A.
      sell Rooster Morris’ children’s books
    2. B.
      persuade kids to attend Rooster Morris’ school
    3. C.
      encourage children to write
    4. D.
      attract customers for Laid-Back West, Inc

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