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问题 选择题

已知x=1是一元二次方程x2-2mx+1=0的一个解，则m的值是（　　）

A．1

B．0

C．0或1

D．0或-1

答案

把x=1代入方程x2-2mx+1=0，可得1-2m+1=0，得m=1，

故选A．

单项选择题 案例分析题

The food we eat seems to have profound effects on our health.Although science has made enormous steps in making food more fit to eat ,it has, at the same time,made many foods unfit to eat. Some research has shown that perhaps eighty percent of all human illnesses are related to diet and forty percent of cancer is related to the diet as well,especially cancer of the colon. Different cultures are more likely to cause certain different illnesses because of the food that is characteristic in these cultures. That food is related to illness is nto a new discovery. In 1945, about 35 years ago, government researchers realized that nitrates, commonly used to preserve color in meats,and other food additives,caused cancer. Yet, these carcinogenic additives remain in our food, and it becomes more difficult all the time to know which things on the packaging labels of processed food are helpful or harmful. The additives which we eat are not all so direct. Farmers often give penicillin to beef and living animals, and because of this ,penicillin has been found in the milk of treated cow. Sometimes similar drugs are given to animals not for medical purposes,but for financial reasons. The farmers are simply trying to fatten the animals in order to obtain a higher price on the market. Although the Food and Drug Administration(FDA) has tried repeatedly to control these procedures, the practices continue.

What are nitrates used for?（）

A.They preserve flavor in packaged foods.

B.They preserve the color of meats.

C.They are the objects of research.

D.They cause the animals to become fatter.
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单项选择题

下列不属于刑事司法工作的一项是( )

A．刑事侦查工作

B．国外安全保卫工作

C．刑事强制工作

D．羁押工作与执行刑罚工作
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