6.There are desert plants which survive the dry season in the form of inactive seeds.There are also desert insects which survive as inactive larvae (幼蟲).In addition,difficult as it is to believe,there are desert fish which can survive through years of drought (干旱) in the form of inactive eggs.These are the shrimps (蝦) that live in the Mojave Desert,an extremely dry place in the southwest of the United States where shade temperatures of over 50℃are often recorded.
The eggs of the Mojave shrimps look like grains of sand both in size and appearance.When enough spring rain falls to form a lake,once every two to five years,these eggs hatch.Then the water is soon filled with millions of tiny shrimps about a millimetre long which feed on tiny plant and animal organisms (有機(jī)物)which also grow in the temporary desert lake.Within a week,the shrimps grow from their original 1millimetre to a length of about 1.5centimetres.
Throughout the time that the shrimps are rapidly maturing,the water in the lake equally rapidly evaporates(蒸發(fā)).Therefore,for the shrimps it is a race against time.By the twelfth day,however,when they are about 3centimetre long,hundreds of tiny eggs form on the underbodies of the females.Usually by this time,all that remains of the lake is a large,muddy patch of wet soil.On the 13th day,the shrimps lay their eggs in the mud.Then,having ensured that their species will survive,the shrimps die as the last of the water evaporates.
If enough rain falls the next year to form another lake,the eggs hatch,and once again the shrimps pass rapidly through their cycle of growth,adulthood,egg-laying,and death.Some years there is not enough rain to form a lake:in this case,the eggs will remain dormant for another years,or even longer if necessary.
74.Which of the following is the MOST unique feature of Mojave shrimps?C
A.Their lives are brief.
B.They feed on plant and animal organisms.
C.Their eggs can survive years of drought.
D.They lay their eggs in the mud.
75.What doe the underlined word"dormant"in the last paragraph most probably mean?A
A.Inactive. B.Sleeping. C.Safe. D.Dead.
76.What can be inferred from the passage?D
A.Appearance and size are the most important for life to survive in the desert.
B.A species must be able to grow up quickly in order to survive.
C.Shrimps are the only species with a life cycle of 13days.
D.Some species develop a unique life pattern to survive in extremely hard condition.
77.What is the passage mainly about?B
A.The life span of Mojave shrimps
B.The survival of desert shrimps
C.The creatures living in the Mojave desert
D.The importance of water to life in the desert.
分析 本文是一篇說明類文章.文章主要介紹了在干旱的莫哈維沙漠中生活的莫哈維蝦的生存、繁殖方式.
解答 74-77 CADB
74,C 事實(shí)細(xì)節(jié)題.根據(jù)文章最后一段第二句"Some years there is not enough rain to form a lake:in this case,the eggs will remain dormant for another years,or even longer if necessary."可知,本題的答案是C.
75 A 詞義推測題.根據(jù)文章最后一段第二句"Some years there is not enough rain to form a lake:in this case,the eggs will remain dormant for another years,or even longer if necessary."可以推測出,dormant的意思是"休眠的,靜止的".A的意思是"不活躍的,不活動(dòng)的",B的意思是"睡覺的",C的意思是"安全的",D的意思是"死的".故本題的答案是A.
76 D 推理判斷題.根據(jù)文章第一段"There are desert plants which survive the dry season in the form of inactive seeds.There are also desert insects which survive as inactive larvae (幼蟲).In addition,difficult as it is to believe,there are desert fish which can survive through years of drought (干旱) in the form of inactive eggs.These are the shrimps (蝦) that live in the Mojave Desert,an extremely dry place in the southwest of the United States where shade temperatures of over 50℃are often recorded."可知,干旱的沙漠中也有動(dòng)植物生存,它們有自己獨(dú)特的方式來適應(yīng)沙漠的惡劣的環(huán)境.故本題的答案是D.
77 B 主旨大意題.根據(jù)文章可知,文章主要介紹了在干旱的莫哈維沙漠中生活的莫哈維蝦的生存、繁殖方式.故本題的答案是B.
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