42. From the second paragraph we learn that __

　　 A. monsoons usually come at certain times of the year

　　 B. there are no known ways to predict hurricanes

　　 C. there are warning signs before earthquakes strike

　　 D. a tornado can come at any time, and is hard to predict

41. What does the passage mainly tell us about?

　　 A. How to predict earthquakes.

　　 B. What to do during an earthquake.

　　 C. The damage an earthquake can cause.

　 　D. The factors that cause an earthquake.

40. writing　 练习做某事应用practise doing sth。

39. who　 引导定语从句，先行词是those。

38. advice　 一条建议，此处应用名词。

37. If　 前后是条件关系。

36. their　 指代前面的words。

35. to memorize　 不定式作真正主语。

34. A　 好的记忆力有助于学习，memory为可数名词。