单项选择
1. It took them several weeks to _____the wild horse.
A. cultivate B. civilize C. curb D. tame
2. By the time you graduate, we _____in Australia for one year.
A. will be staying B. will have stayed
C. would have stayed D. have stayed
3. He appreciated _____the chance to deliver his thesis in the annual symposium on Comparative Literature.
A. having given B. to have been given
C. to have given D. having been given
4. They left for the airport very early in the morning _____traffic jam.
A. in line with B. at the risk of
C. in case of D. for the sake of
5. Living in the desert involves a lot of problems, _____water shortage is the worst.
A. not to mention B. of which
C. let alone D. for what
参考答案
1. D。文章的主要内容是在不同的地区和地理、温度、气候条件下海洋的盐度。
2. B。根据文中信息，在沿岸地区，因为有淡水河流的注入，所以盐度较低。
3. D。文中第一段指出，蒸发使海洋失去水分，留下了盐分，盐的浓度就此增加。降水、径流、溶化都是减少盐分的过程。
4. A。subtraction的意思是“减少，抽走”。
5. C。文中很明确指出，海洋中冰的形成会引起盐度的增加。所以C显然不是海水结冰的结果。
6. B。relevant to：相关，切题。
7. D。“成立一个委员会”：to set up a committee。set up在这里是“创立、开办、建立”的意思。
8. C。draw attention to something: 把某人的注意力吸引到……上来。也可以说attract one's attention to something。
9. B。give birth to：生子，产崽。因为有完成时态的标志词since，所以必须用现在完成时。
10. D。hence是个副词，“因此”。这个词较正式，用法也较特殊，后面的动词经常省略。直接跟名词、形容词。