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问题 填空题

把3米长的绳子平均分成5份，每份占全长的______，每份长有______米．

答案

1÷5=

1
5
，

3÷5=

3
5
（米）；

答：每份占全长的

1
5
，每份长有
3
5
米．

故答案为：

1
5
，
3
5
．

完形填空

Air is very important to everything that lives. But the air we breathe is g小题1:___ dirty. People all over the world are looking for w小题2:___ to make it clean again.

Have you e小题3:__ watched the smoke from chimneys rising high in the air? Have you s小题4:__ the smoke from cars and trucks on roads or the smoke from planes? The smoke is not g小题5:___ to breathe. If we want to keep well and strong, we need to breathe c小题6:__ air.

W小题7:___ more and more factories everywhere and more and more cars, trucks and planes, it is getting harder and harder to do with the air p小题8:___.

Scientists have a小题9:__ found ways to stop or slow down some of the things that make the air dirty. They will not stop working u小题10:__ we have clean air again.
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选择题

20世纪六七十年代，世界格局多极化趋势出现。促成多极化趋势出现的因素包括

①欧盟的建立②日本崛起为世界经济大国③不结盟运动兴起④苏联的解体 [ ]

A、①②

B、②③

C、①③

D、②④

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