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　　【1】_____ man can now create radioactive elements, there is nothing he can do to reduce their radioactivity.

　　A. As long as

　　B. As

　　C. Even

　　D. While

　　【2】Dried leaves continue to hang on the branches of some trees _____ the new leaves appear.

　　A. until

　　B. that

　　C. by

　　D. from

　　【3】Leave your key with your neighbor _____ you lock yourself out one day.

　　A. ever since

　　B. even if

　　C. soon after

　　D. in case

　　【4】We thought there were 35 students in the dining hall, _____, in fact, there were 40.

　　A. while

　　B. whether

　　C. what

　　D. which

　　【5】He gets along very well with his American friends, _____.

　　A. despite he does not speak English

　　B. in spite of he does not speak English

　　C. although he does not speak English

　　D. for he does not speak English

　　参考答案：

　　【1】D【解析】本句句意是：虽然人类现在可以制造放射性元素，但要降低放射性还无能为力。As long as“只要”;As“因为”;even“甚至”;While“当……的时候，虽然、尽管，然而”。故选D

　　【2】A【解析】本句句意是：干枯的叶子会一直挂在枝头，直到新叶长出来。until表示“直到”，引导时间状语从句。故选A

　　【3】D【解析】本句句意是：把钥匙留给你的邻居，以防你将自己锁在门外。ever since“自从”;even if “即使”;soon after “不久之后”;in case“以防”。故选D

　　【4】A【解析】本句句意是：我们以为食堂有35名学生，然而实际上有40名。while“当……的时候，然而”;whether“是否”;what “什么”;which“哪一个”。故选A

　　【5】C【解析】本句句意是：尽管他不会说英语，但他和他的美国朋友相处得很好。despite介词“即使，尽管”，其后接名词或短语;in spite of“尽管”，后只能跟名词或名词短语;although为连词，表示“虽然，尽管”;for可做连词，表示“因为”。故选C