1.We mustn’t relax our vigilance___.
A in the least B at least C at most D in the end
　　
2. During the reading lesson, the teacher asked the students to read a few __ from the novel.　　
A pieces B essays C fragments D extracts
　　
3. But they also __ beyond the individual places and consider the earth as a whole.　　
A pass B reach C go D set
　　
4. How human beings and their environment act __ each other.　　
A upon B for C as D to
　　
5. The mere fact __ most people believe nuclear war would be madness does not mean that it will not occur.
A what B which C that D why

（做完后才能看答案哦！）
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