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！）