已知|a|=|b|，ab<0，m、n互为负倒数，且x+x3=0，（x-1+m）2

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问题选择题

已知|a|=|b|，ab<0，m、n互为负倒数，且x+x³=0，（x-1+m）²+|2m+4+y|=0，则3amn（x+2）+by+m-n的值是 [ ]

A．0

B．1

C．2

D．不确定

答案

答案：C

句型转换

句型转换。

1. Can you play the piano? (作否定回答)

______, I ______.

2. She wants to join the music club. (对画线部提问)

______ ______ ______ she______ to join?

3. The club can help kids with swimming.(改为一般疑问句)

______the club_____ kids with swimming.

4. June can draw.(对画线部分提问)

______ ______June______ ?

5. My sister wants to join the art club.(改为否定句)

My sister______ ______ to join the art club.

单项选择题

下列______命令可以更改一个文件的权限设置。

A．attrib
B．file
C．chmod
D．change