Question

11．The crab is a living clock．It tells the time of the day by the colour of its skin，which is dark by day and pale by night．The crab's changing skin colour is a regular twenty-four hour cycle（周期）that follows the daily rhythm（循環(huán)）of the sun．
    Does the crab really keep time，or is its skin simply affected by the sun's rays（光線），changing colour with the amount of the sunlight？To find out the answer，scientists kept some crabs in a dark room for two months．Even without daylight the crabs'skin colour continued to change．
    The change probably had something with the rhythm of the sun，to help protect the crab from the sunlight and enemies．After millions of years it has become completely regular inside the living body of the crab．
    Scientists noticed that once each day the colour of the crab is especially dark，and that each day this appears about fifty minutes later than the day before．From this they discovered that each crab follows not only the rhythm of the sun but also that of the tides（潮汐）．The crab's darkest period（一段時(shí)間）is the time of low tide on the beach where it is caught．
33．The crab's changing colourB．
A．tells the crab what time it is               
B．protects the crab from the sunlight
C．keeps the crab warm                     
D．gives the crab a lot of energy
34．Scientists studied crabs in order to find outC．
A．why they change colour                   
B．how to use them as clocks
C．whether they change colour                
D．where they can be caught
35．When the crabs were kept in the dark，D．
A．they didn't change colour                   
B．they changed colour more quickly
C．they changed colour more slowly             
D．they changed colour as usual
36．The crab is like a clock because its colour changesA．
A．in a regular 24-hour rhythm           
B．a(chǎn)t low tide
C．with the sun's rays                   
D．every fifty minutes．

Answer 1

分析 本文主要向我們介紹了可以作為我們生物鐘的螃蟹：它通過它膚色顏色的變化來告訴人們時(shí)間，螃蟹的膚色變化是一個(gè)規(guī)律的二十四小時(shí)周期，遵循太陽的日常節(jié)奏．為了證實(shí)這一點(diǎn)，下文科學(xué)家作了實(shí)驗(yàn)，即科學(xué)家們?cè)诤诎档姆块g里養(yǎng)了兩個(gè)月的螃蟹，即使沒有光線，螃蟹的膚色也會(huì)繼續(xù)變化．文章作了具體介紹．

解答 33 B 細(xì)節(jié)理解題：根據(jù)第三段The change probably had something with the rhythm of the sun，to help protect the crab from the sunlight and enemies這種變化可能與太陽的節(jié)奏有關(guān)，幫助保護(hù)蟹免受陽光和敵人的傷害．故選B．其余三項(xiàng)均不符合文章的意思．
34 C 細(xì)節(jié)理解題：根據(jù)第二段To find out the answer，scientists kept some crabs in a dark room for two months．Even without daylight the crabs'skin colour continued to change．為了找到答案，科學(xué)家們?cè)诤诎档姆块g里養(yǎng)了兩個(gè)月的螃蟹，即使沒有光線，螃蟹的膚色也會(huì)繼續(xù)變化．故選C．
35 D 細(xì)節(jié)理解題：根據(jù)第二段To find out the answer，scientists kept some crabs in a dark room for two months．Even without daylight the crabs'skin colour continued to change．為了找到答案，科學(xué)家們?cè)诤诎档姆块g里養(yǎng)了兩個(gè)月的螃蟹，即使沒有光線，螃蟹的膚色也會(huì)繼續(xù)變化．故選D．
36 A 細(xì)節(jié)理解題：根據(jù)第一段The crab's changing skin colour is a regular twenty-four hour cycle（周期）that follows the daily rhythm（循環(huán)）of the sun．螃蟹的膚色變化是一個(gè)規(guī)律的二十四小時(shí)周期，遵循太陽的日常節(jié)奏．故選A．

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