不属于冠心病主要危险因素的是______ A．吸烟 B．高血压 C．酗酒 D．年

杂物电梯有哪些机械安全装置？

The best way of learning a language is using it. The best way of learning English is talking in English as much as possible. Sometimes you'll get your words mixed up (混合) and people will not understand you. Sometimes people will say things too quickly and you can't understand them. But if you keep your sense of humor, you can always have a good laugh at the mistakes you make. Don't be unhappy if people seem to be laughing at your mistakes. It's better for people to laugh at your mistakes than to be angry with you, because they don't understand what you are saying. The most important thing for learning English is: "Don't be afraid of making mistakes because everyone makes mistakes."

1. The writer thinks that the most important thing for you to learn a language is___________.

A. reading      B. writing     C. using     D. listening

2. What should you do in learning English?

A. Try to make some mistakes.              B. Avoid making any mistakes.

C. Remember as many new words as you can.  D. Use it as often as you can

3. If people laugh at the mistakes you make, you should ___________.

A. be angry with them                 B. be angry with yourself

C. not care                          D. believe you are right

4. When you make a mistake, you should___________.

A. never make any mistakes again     B. tell others not to make the same mistake

C. punish yourself for making it       D. keep your sense of humor

5. The story tells us:" ___________."

A. It is normal (正常的) that we make some mistakes in learning English

B. Everyone must make mistakes

C. We can avoid making mistakes in learning a language

D. Laughing can help one learn English well

佛尔哈德法的滴定终点理论上应在（）到达，但实际操作中常常在（）到达，这是因为AgSCN沉淀吸附（）离子之故。

在linux的查询命令有那些（）。

A.man

B.find

C.whereis

D.locate

试分析比较俄国十月革命、德国十一月革命和匈牙利1919年革命的异同点。