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问题 填空题
函数y=
2x-2
x
的定义域为______．
答案

由题意知：

2x-2
x
≥0

∴

2x-2≥0
x＞0
或
2x-2≤0
x＜0
，

解得x＜0或x≥1，所以函数的定义域为：{x|x≥1或x＜0}．

故答案为：{x|x≥1或x＜0}．

单项选择题 B型题

上运动神经元瘫痪（）。

A.肌力减退

B.病理征阳性

C.既有肌力减退，也有病理征阳性

D.肌力正常、病理征阴性

E.肌张力增高，病理征阴性
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单项选择题

In country after country, talk of nonsmoker’s right is in the air. While a majority of countries have taken little (51) no action yet, some 30 nations have introduced legislated steps to control smoking. Many laws have been introduced in other countries to (52) clear the air for nonsmokers, or to cut cigarette consumption.

Smoking is harmful (53) the health of people. World governments should conduct serious campaigns against it. (54) on cigarette advertisements, plus health warnings on packages and ban on public smoking in certain places, (55) as theaters, cinemas and restaurants, are the most popular tools used by nations in (56) of nonsmokers or in controlling smoking. But world attention is also focusing on another step (57) will make the smoker increasingly self-conscious and uncomfortable about his habit. Great efforts should be made to (58) young people especially of the dreadful consequences of taking up the habit. And cigarette price should be raised.

In the long run, (59) is no doubt that everybody would be much better-off if smoking were banned altogether but many people are not (60) for such drastic action.

56().

A.short 

B.support 

C.some 

D.any
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