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新托福阅读解析:Saving Soil and Cropland

2017-04-24 11:38:57来源：新东方在线整理

　　这道题真的不选B……而必须选C!

　　Ryan and his colleagues measured the rates of predation in tungara frog choruses of different sizes. Large choruses of frogs did not attract more bats than small choruses, and consequently the risk of predation for an individual frog was less in a large chorus than in a small one. Predation was an astonishing 19 percent of the frogs per night in the smallest chorus and a substantial 1.5 percent per night even in the largest chorus. When a male frog shifts from a simple whine to a whine-chuck call, it increases its risk of attracting a female, but it simultaneously increases its risk of attracting a predator. In small choruses, the competition from other males for females is relatively small, and the risk of predation is relatively large. Under these conditions it is apparently advantageous for a male tungara frog to give simple whines. However, as chorus size increases, competition with other males also increases while the risk of predation falls. In that situation, the advantage of giving a complex call apparently outweighs the risks.

　　According to paragraph 5, all of the following are true about tungara frog vocalizations EXCEPT:

　　The larger the frog chorus, the smaller the chance there is of a particular frog being eaten by a predatory bat.

　　The larger the frog chorus, the louder each individual frog calls.

　　The smaller the frog chorus, the easier it is for a frog to attract a female.

　　The smaller the frog chorus, the more likely it becomes that frog using the whine-chuck vocalization will be attacked by a bat

　　Which of the following can be inferred from paragraph 5 about the behavior of male tungara frogs?

　　When in small choruses they use less effective mating calls to decrease their risk of predation.

　　They avoid joining a large chorus in a breeding pool because it increases the risk of predation.

　　They avoid the use of the whine-chuck call whenever there is the risk of predators.

　　They attempt to avoid predation by making their calls at night.(答案见下一页)

本文关键字: 2017年4月23日托福 托福阅读考试回忆

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