10．Sorry, I have no time left now. Can we discuss the matter ________ supper?

　　答案：over　考查介词。句意：对不起，我现在没空。我们吃晚饭时讨论这件事，好吗？由句意可知，选over，意为“在……期间”相当于during。

　　11．A competent speaker of a language must have ________ command of these different styles.

　　答案：a　句意：能够熟练使用某种语言的人必须掌握这几种技巧。have a command of“掌握”，符合句意。

　　12．The boss insisted that every minute ________(be) made full use of ________(do) the work well.

　　答案：(should)be；to do　句意：为了做好工作，老板要求应该充分利用每分钟。insist后所接的宾语从句应该使用should＋动词原形，且should可以省略；不定式to do the work well在句中作目的状语。

　　.阅读理解

　　(2017·丰台区期末练习)

　　Can a Language Become Extinct?

　　A language can become extinct when the last person who can speak it passes away. Or more likely when the second­last person who speaks it dies because then there is no one left to talk to. According to linguists (语言学家) there is nothing unusual about a single language dying out. But what is happening today is quite remarkable. According to the recent statistics, there are approximately 6,000 languages in the world as we speak. Of these, about half are going to die out in the next century.

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