第四部分根据短文的内容和首写字母填上适当的单词(10’)

Dear Jin Jing,

Your problem is a c_ 小题1:_____ one among middle school students. Maybe the following a____小题2:__ can help you. First of all, b_小题3:___ in yourself. Your greatest problem is that you lack self-confidence. The first thing you must do is to s___小题4:___ at your classmates. One smile speaks louder about your wish to make friends than any words. Your smile will s小题5:_ that you are f____小题6:__ to them.. Next, t____小题7:___ talking with a student who is as shy as you or who s____小题8:__ the same interest as you. You can discuss your studies with a classmate and you can talk about your h____小题9:_ as well. If anyone is in trouble, you should be ready to help him or her. Once you have confidence, you can make as many friends as p小题10:__. 

Yours

Lily

普萘洛尔的降压机制不包括（）

A.阻断心脏的β受体

B.阻断突触前膜的β受体

C.阻断血管的β受体

D.阻断肾脏的β受体

E.阻断中枢的β受体