下列各句中，加线的词语使用不恰当的一项是（）（3分） A．历史上曾经人来人往的丝

用面积是9平方分米的方砖铺地，需要方砖960块，如果改用边长是4分米的方砖铺地，需要方砖多少块？（用比例的知识解答）

根据短文内容和所给中文提示，写出空白处各单词的正确形式。每空限填一词。

I am a middle school student. I used to spend too much time __小题1:__(闲聊) on line at night. The next day, I often felt. __小题2:_(困倦的) in class, and I couldn’t .__ 小题3:__(回答) correctly to the teachers when they asked me questions. I made lots of ___小题4:_(错误) in the tests. I didn’t know the __小题5:_(重要) of studying hard. And my mother always __小题6:_(担心) about my school. At __小题7:___ (现在)  I have ___小题8:__(认识到) that it’s silly of me to do that. I listen carefully in class and do my homework__小题9:__(小心地) every day. At night I read some books after finishing the homework to be knowledgeable。I have good grades now. I will be more careful and __小题10:__(耐心)。 My mother and my teachers are very impressed.

阵发性室上性心动过速发作终止后，需要服药预防发作。下列哪项是不正确的

A．发作终止后可口服地高辛维持量1个月

B．发作终止后口服地高辛中如仍有复发，则于发作控制后再服2～3个月

C．奎尼丁对预防综合征复发较好，可持续用半年～1年

D．可用盐酸普萘洛尔(心得安)口服

E．可应用利多卡因

In the office an electrical engineer is looking through the instructions to know ________ the heat system works before the repair work.

A．whether

B．why

C．how

D．that

装药中心过低的原因有那些？