下列四组函数中，两函数是同一函数的是（） A．f（x）=x2与f_爱下问搜题

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问题选择题

下列四组函数中，两函数是同一函数的是（　　）

A．f（x）=

x2

与f（x）=x

B．f（x）=(

x

)2与f（x）=x

C．f（x）=x与f（x）=

3	x3

D．f(x)=

x2

与f(x)=

3	x3

答案

A中的两个函数的值域不相同，故不是同一个函数．

B中的两个函数的定义域不同，故不是同一个函数．

C中的两个函数具有相同的定义域、值域、对应关系，故是同一个函数．

D中的两个函数的值域不相同，故不是同一个函数．

综上，只有C中的两个函数是同一个函数，

故选 C．

阅读理解

任务型阅读。下面有五段电视节目内容的解说词。请根据内容把序号填入相应的节目名称前。

A. People might grow plants and vegetables in the sea in about 50 years.

B. The lost World is an exciting American film. People, especially school students may like it better.

C. Even if you could buy the world, you could not buy a happy family, good friends or knowledge.

D. For families with children, an important problem is getting the children away from the television to do their

homework.

E. When you need help for your homework, go to the library. You may find magazines, newspapers, and big

dictionaries there. They can always help you.

1. Money Isn't Everything __________.

2. Activities For Free Time _________.

3. Study Tools ___________________.

4. Farms of the Future ____________.

5. Parents' Headache _____________.

问答题简答题

简述急性一氧化碳中毒迟发脑病。