协助病人坐轮椅时，不正确的操作是（） A.先检查轮椅性能 B.拉起车闸固定车轮

结缔组织疾病引起浅表淋巴结肿大一般不包括下列哪种疾病

A．幼年型类风湿病

B．多关节型类风湿关节炎

C．结节性多动脉炎

D．结节病

E．川崎病

温度计：水银

A．发动机：汽油

B．热水器：水

C．衣服：扣子

D．蓄电池：硫酸

What is language for? Some people seem to think it's for practising grammar rules and learning lists of words—the longer the lists，the better. That's wrong. Language is for the exchange（交流）of ideas and information. It's meaningless knowing all about a language if you can't use it freely. Many students I have met know hundreds of grammar rules, but they can't speak correctly or fluently（流利地）. They are afraid of making mistakes. One shouldn't be afraid of making mistakes when speaking a foreign language. Native speakers make mistakes and break rules, too. Bernard Shaw once wrote, "Foreigners often speak English too correctly. "But the mistakes that native speakers make are different from those that Chinese students make. They're English mistakes in the English language. And if enough native speakers break a rule, it is no longer a rule. What used to be wrong becomes right. People not only make history, they make language. But a people can only make its own language. It can't make another people's language. So Chinese students of English should pay attention to grammar, but they shouldn't overdo（做过头）it. They should put communication（交际）first.　

1．Language is used to ________.

A. express oneself　　     　       B. practice grammar rules

C. talk with foreigners only            D. learn lists of words

2．Generally, when an American or an Englishman speaks English, he ________.

A. never makes mistakes　　          B. often makes mistakes

C. can't avoid making mistakes         D. always makes mistakes

3．"Foreigners often speak English too correctly. "This sentence means that ________.

A. foreigners speak correct English   

B. foreigners speak incorrect English

C. foreigners speak English according to the grammar rules

D. foreigners never make mistakes when they speak English

4．If too many native speakers break a rule,  ________.

A. what they use will become right       B. they are against the law

C. they should say sorry to others        D. they will become heroes

联轴器的功用是什么？常用的联轴器是什么类型？

为什么要变房屋出租业务为投资业务？