2. The word "vulnerable" in Paragraph 4 probably means _________.

　 　 A. easy to be hurt　　 B. easy to be protected

　　 C. easy to be used　　 D. easy to be influenced

1. What does the underlined sentence in the first paragraph mean?　 No 1 p 7

　 　　 A. Rocket scientists are making researches on people’s health.

　 　 B. It's obvious that air pollution has a bad effect on people’s health.

　 　 C. People aren't sure whether taking deep breaths on a smoggy day is bad.

　 　 D. People often have a hard time when taking deep breaths on a smoggy day.

10．despite　 根据上下文此处需要使用“尽管……但是”，由于后面是名词短语，不能用though等。

9．until　 until now表“直到现在”：

8．As　 as引导的时间状语从句，表“随着……”

7．have built　 考查动词的现在完成时态：

6．so　 so many+可数名词复数，so much+不可数名词表“那么多的……”

5．for　 overflow for miles表示淹没持续了-段距离。

4．its　 指代前面的名词plain，考查形容词性物主代词；