标题: 支持题的一个类型疑惑 [打印本页] 作者: 寂寞的自由 时间: 2004-2-4 09:52 标题: 支持题的一个类型疑惑 Bats emit sounds and generally use the echooes of these sounds highly efficiently to detect,locate, and catch their prey. However, it is claimed that the characteristic efficiency of this process is reduced by moths able to hear the sounds emitted by insect-eating bats.
B) those moth species that cannot hear the sounds emitted by insect-eating bats are among the species of insects that are most likely to be caught by such bats. D)Moth species that can hear the sounds emitted by insecteating bats are less likely to be caught by such bats than are moth species that cannot hear these sounds. 正确答案是D，但是自由不明白B为什么不对呢？谢谢大家。作者: 橙子 时间: 2004-2-4 11:07
Ｂ中提到最不容易被抓住的＂ＩＮＳＥＣＴ＂（不是＂ＭＯＴＨ＂）是听不见蝙蝠发出声音的蛾子而没有说听得到蝙蝠发出声音的蛾子是否容易被抓住．所以Ｂ错误 而Ｄ把听得到声音的蛾子和蝙蝠抓虫的效率联系到一起，所以Ｄ正确