六级经典阅读6
If sufficient 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 insufficient rain to form a lake ：in this case， the eggs will remain formant for another year， or even longer of necessary. Very， very occasionally， perhaps twice in a hundred year， sufficient rain falls to form a deep lake that lasts a month or more. In this case， the species passes through two cycles of growth， egg-laying， and death. Thus， on such occasions， the species multiplies considerably， which further ensures its survival.
21.Which of the following is the MOST distinctive feature of Mojave shrimps？
A） Their lives are brief.
B） They feed on plant and animal organisms.
C） Their eggs can survive years of dought.
D） They lay their eggs in the mud.
22.By saying “for the shrimps it is a race against time ”（Para.3，Line 2）the author means_____.
A） they have to swim fast to avoid danger in the rapidly evaporating lake
B） they have to swim fast to catch the animal organisms on which they survive
C） they have to multiply as many as possible within thirteen days
D） they have to complete their life cycle within a short span of time permitted by the environment
23.The passage mainly deals with_____.
A） the life span of the Mojave shrimps
B） the survival of desert shrimps
C） the importance of water to life
D） life in the Mojave Desert
24.The word “dormant”（Para.4，Line 3）most probably means______.
A） inactive
B） strong
C） alert
D） soft
25.It may be inferred from the passage that______.
A） appearance and size are most important for life to survive in the desert
B） a species must be able to multiply quickly in order to survive
C） for some species one life cycle in a year is enough to survive the desert drought
D） some species develop a unique life pattern to survive in extremely harsh conditions
答案：Passage 1 CCCAB
Passage 2 BDACB
Passage 3 CDBAD