【四六级考试网 - 大学英语四六级考试(CET)试题】：
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 drought.

　　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