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问题 选择题

下列运算不正确的是（　　）

A．-5+3=-2

B．（-2）×5=-10

C．-32=9

D．-2-2=-4

答案

A、-5+3=-2，故本选项正确；

B、（-2）×5=-10，故本选项正确；

C、-32=-9≠9，故本选项错误；

D、-2-2=-4，故本选项正确．

故选C．

填空题
已知向里
.
a
=（2，4），
.
b
=（1，1），若向量（
.
a
-m
.
b
）⊥（m
.
a
+
.
b
），则正实数m=______．
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填空题

词汇考查。

1. It's Sarah's birthday tomorrow. Can you give me your a              ?

2. I have a good c               named Joe.

3. They went to the beach i               of climbing mountains.

4. Many people have their p               computers at home.

5. There are many m               in the room. You'd better not put the food here.

6. My brother keeps a r               as a pet. It's white and it has two long ears.

7. Barry is i              in English, so he is good at it.

8. Look at my photo a              . There are many photos in it.

9. "P              " is another way of saying "gift."

10. The boy reads English for an hour every moring, so he makes p              .

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