在直角三角形中，两个锐角成反比例．______．

Smoking is bad for our health. Every year       people get sick because of smoking. Some even die because of       .

It’s quite dangerous for us to smoke .Smokers only want to try it at       . But they smoke more and more, and when they want to give it up, they can’t .The habit is so       that smokers find it very hard to give up. Some people have got cancer .Some of them lost their lives.      likes to stay together with smokers because the smoke is       for others.

Since smoking is so harmful, smokers should       the bad habit. You can try changing it little by little. When you want to smoke,       some fruit or snacks. You can also do some       things to make you     something else.

Please give up smoking for your and your family’s health.

小题1:A . much      B. many       C. few      

小题2:A. him        B. them       C. it

小题3:A. last        B. once        C. first     

小题4:A. strong      B. weak        C. long      

小题5:A. Everyone    B. Someone    C. Nobody   

小题6:A. necessary    B. bad        C. useful

小题7:A. stop        B. take off      C. put off    

小题8:A. eat         B. drink        C. send      

小题9:A. another     B. other        C. others

小题10:A. think of    B. remind of     C. recalling

某公司为了促销，将其中一种原标价为120元的商品，先提价30%后再打8折出售，则销售该商品的利润将从50%变为（    ）%。

决定抗原特异性的物质基础是（）

A.分子质量

B.物理性状

C.化学成分

D.结构的复杂性

E.表面特殊的化学基团

按钮的元件有几种？（）

A．2种

B．3种

C．4种

D．1种

植物检疫的目的和任务什么？