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问题 填空题
已知
2x+y=3
x+y=1
的解是方程组
2x+my=2
nx+y=1
的解，则m=______，n=______．
答案

解方程组

2x+y=3
x+y=1
得
x=2
y=-1
，

把

x=2
y=-1
代入方程组
2x+my=2
nx+y=1
得
4-2m=2
2n-1=1
，解得m=2，n=1．

故答案为2，1．

单项选择题

组合逻辑电路如图所示，当输入端A=1、B=1时，输出端L1、L2、L3为（）。

A．L1＝1，L2＝0，L3＝1

B．L1＝0，L2＝1，L3＝0

C．L1＝1，L2＝1，L3＝0

D．L1＝0，L2＝0，L3＝1
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句型转换

句型变换。

1. Hunters will kill it for its fur if they catch a giant panda. (对划线部分提问)

    __________________________ if they catch a giant panda?

2. My father always drives carefully when he sends me to school. (对划线部分提问)

    _________________________ when he sends you to school?

3. I was doing shopping when the earthquake started. (对划线部分提问)

    ______________________ when the earthquake started?

4. More and more birds are in danger because they do don't have enough living space. (改为同义句)

    More and more birds are in danger because there are _______ _______ _______ living space for them.

5. Many people do not understand how important the wetlands are. (改为同义句)

    Many people do not understand _______ _______ _______ the wetlands.

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