答案1-5ADCAC
1.选A ① in the least 丝毫，一点They don’t in least understand this.
②in the end 最后，终于
In the end they reached their destination before dusk.
③at least至少
④at most至多
2.选D ① extract 做节录，引文，选段
He applied to the publisher for permission to reprint an extract.
②fragment 碎片，断片，(文艺作品等的)残存部分
Liberty and civilization are only fragments of rights wrung from the strong hands of wealth and book learning.
③essay 散文，小品文，随笔，短文，评论
3.选C go beyond超过，超出 These issues go beyond the range of language study. 而set和pass，reach不与beyond搭配。
4.选A ①act upon作用于 This drug act upon (on) the nerves.
②act as 作为……而作出反应，充当
His job was to act as a link between the government and the press.
③work at从事 She had been wondering what she should work at in order to gain her doctorate.
5.选C 从句子结构来看，fact后接的是同位语从句。