2017届高考英语一轮复习单元训练：6.4《Globalawarming》（新人教版含解析）_高考复习指南

　　A．Gray squirrels do more harm to the forest than red squirrels.

　　B．Red squirrels and gray squirrels have helped the spread of walnut trees.

　　C．The cleaning of forest land benefits gray squirrels directly.

　　D．Human beings should bear some responsibility for the decreasing number of gray squirrels.

　　答案：D　细节理解题。利用排除法，根据第四段“...as more forests were cut for agriculture.”可知D项正确，A项未比较过；B项应是Gray squirrels有助于walnut tree的传播；C项“directly”描述错误。

　　1．gather vt. 收集；集合

　　2.affect vt. 影响

　　3．central adj. 中心的；中央的

　　4．decrease n．/vt. 减少；降低

　　5．invade vt. 侵略

　　1．a number of 许多的；大量的

　　2．be native to 源于……；原产于……

　　原文：But Professor Swihart says their numbers began to decrease as more forests were cut for agriculture.(as引导时间状语从句)

　　译文：但是Swihart教授说随着更多的森林为了农耕被砍伐，它们(松鼠)的数量开始下降。

　　仿写：The book explains how animals and plants develop as_the_environment_changes.

　　这本书解释了随着环境的变化，动植物是如何进化的。

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