题目内容
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 (幼虫).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 (虾) 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 (有机物)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(蒸发).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 本文是一篇说明类文章.文章主要介绍了在干旱的莫哈维沙漠中生活的莫哈维虾的生存、繁殖方式.
解答 74-77 CADB
74,C 事实细节题.根据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,本题的答案是C.
75 A 词义推测题.根据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."可以推测出,dormant的意思是"休眠的,静止的".A的意思是"不活跃的,不活动的",B的意思是"睡觉的",C的意思是"安全的",D的意思是"死的".故本题的答案是A.
76 D 推理判断题.根据文章第一段"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 (幼虫).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 (虾) 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,干旱的沙漠中也有动植物生存,它们有自己独特的方式来适应沙漠的恶劣的环境.故本题的答案是D.
77 B 主旨大意题.根据文章可知,文章主要介绍了在干旱的莫哈维沙漠中生活的莫哈维虾的生存、繁殖方式.故本题的答案是B.
点评 学生需要认真阅读原文,把握文章大意,对文章脉络有整体的了解,能仔细查找文中细节,并能根据文章内容进行合理的推测判断.