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问题 选择题

方程（x-1）2=1-x的根是（　　）

A．0

B．1

C．-1和0

D．1和0

答案

（x-1）2=1-x

（x-1）2-（1-x）=0

（x-1）（x-1+1）=0

x1=1，x2=0

故选D

填空题

单词拼写。

1. I asked her if she was ready to go, and she n______.

2. Little Tommy stood in the comer, with t______ in his eyes.

3. Mr. Smith always helps others t______ he is very busy.

4. The boy was standing with his back ______(向) me.

5. Could you pass me a packet (包) of ______(香烟) ?
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单项选择题

下面有关描述中，不正确的是( )。

A．键盘只是输入设备，不是是输出设备

B．热敏打印机是一种击打式打印机

C．访问速度最快的内存是Cache

D．用户可对CDROM光盘进行读和写操作
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