测定过程中一系列有关因素微小的随机波动而形成的具有相互抵偿性的误差，称为（）。 A.

阅读短文，从A-D 中选出恰当的句子填入文中1-4 处，然后回答第5 题。

       What would you do if a stranger gave you some medicine and he said it would keep you slim or

help you do well in exams? Would you take it?

       Many middle school students have learned to keep themselves safe by saying "no".  1  .Drugs are

dangerous to your health!

       Because most of teens don't know much about drugs, they might want to try them. Liu, 16, was a

good student before trying drugs.  2   .He decided to have a try. After taking drugs only once, he found

it very hard to stop. Liu began to spend all his time and money on drugs. Soon, he stopped going to

school and started stealing (偷).  3   .   

       In China, taking drugs is becoming a big problem for teens. According to a survey, about one million

people in China are using illegal drugs now, and about 74% of them are young people.   4  

       Drugs are dangerous. Never try them, even if you're curious! It is the most important for you to keep safe and healthy.

A. In the end, he was put in prison.

B. In fact, what those strangers want to give them are drugs (毒品).

C. What's worse, there are about 10,000 drug users under 16 now.

D. One day, some old friends told him it would be fun.

5. According to a survey, about        young people in China are using illegal drugs now.

A. 1,000,000          

B. 100,000

C. 10,000              

D. 740,000

I refuse to accept the blame for something ________ was someone else's fault.[      ]

A. who  

B. that

C. as  

D. what

咽部灼伤的治疗有（）。

A.注意呼吸，随时准备气管切开

B.抗炎治疗

C.可行中和治疗

D.可用碳酸氢钠中和酸剂

E.可用激素预防和缓解喉水肿

洋葱根尖有丝分裂染色体标本制作时，用冰箱冷冻处理的作用？

某学生认为考试成功是自己的一贯努力，其归因是（）。

A.内部、不稳定、可控制的

B.外部、稳定、不可控制的

C.外部、不稳定、不可控制的

D.内部、稳定、可控制的