下列变形正确的是（） A．从7+x=13，得到x=13+7 B．从5x=4x+8，

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问题选择题

下列变形正确的是（　　）

A．从7+x=13，得到x=13+7

B．从5x=4x+8，得到5x-4x=8

C．从9x=-4，得到x=-

D．从

=0，得x=2

答案

A、从7+x=13，得到x=13-7，故本选项错误．

B、从5x=4x+8，得到5x-4x=8，故本选项正确．

C、从9x=-4，得到x=-

，故本选项错误．

D、从

=0，得到x=0，故本选项错误．

故选B．

完形填空

II用所给词或词组的适当形式填空 (每小题2分，共20分)

go up deal with ban work out advantage comfortable tiring different make a living rely on

1 Has anything been done to __________ pollution?

2 He was __________ from driving for six months.

3 The poor little girl __________ by selling matches.

4 I hope my lack of experience won’t be to my __________.

5 China and the United States __________ in many aspects.

6 I’m too __________ even to think.

7 The have __________ all these problems by themselves.

8 You can’t __________ the map to find the stream since it’s too samll.

9 With no winds, smoke __________ in a straight line.

10 I couldn’t sleep because the bed was so __________.

多项选择题

喉痉挛的处理措施包括（）。

A.解除诱因

B.面罩吸氧

C.加深麻醉

D.使用肌松剂

E.表面麻醉