1．平面向量的数量积

①通过物理中"功"等实例，理解平面向量数量积的含义及其物理意义；

②体会平面向量的数量积与向量投影的关系；

③掌握数量积的坐标表达式，会进行平面向量数量积的运算；

④能运用数量积表示两个向量的夹角，会用数量积判断两个平面向量的垂直关系。

40. There ________ be a lot of small houses on both sides of the street.

A. used to　　　　　 B. get used to　　　　　　　　 C. would　　　　　　　 D. did use to

39. The girl _________ out alone at night.

　 A. dare not go　　　　 B. dare not to go　　　　　　 C. dares not go　　　　　 D. does not dare go

38. You _________ pay more attention to your spelling next time.

　 　 　A. would　　 　　　 B. should　　 　　　　 C. will　　 　　　　　　 D. shall

37. You _________ do the exercise if you don't want to.

　 　 　A. may not　　 　　 B. can't　　 　　　　　 C. mustn't　　 　　　 　　　 　D. needn't

36. "May I go now?" "No, you ________. "

　　 A. mustn't　 　　　　 　B. needn't　　　　　 　　 C. mightn't　 　　　　　　　 　D. won't

35. The teacher told the students that they ________ keep silent in class all the time.

　　 A. ought to not　　　　　 B. ought not to　　　　　　　　　　 C. ought not to have　　　 D. can't

34. You _________ me about it earlier, but you didn't.

　　 A. should have told　　　　 B. would have told　　　　 C. must have told　　　　 D. should tell

33.1 didn't hear the phone. I _________ asleep.

　　 A. must be　　　　 B. must have been　　　　　　 C. should have been　　　 D. could have been

32. "________ you mind my opening the window?"　　　　　　　　　 "Not at all. "

　　 A. Shall　　 　　　　 B. Should　 　　　　 C. Will 　　　　　 　　D. Would