1、Unit 4微语法填空温馨提示: 加黑部分为复现前面知识1. Throughout the history, there are various theories(theory) about astronomy, which refer to solar system, atmosphere, gravity and so on. It is believed that our earth came into existence(exist) about 3 billion years ago. Everything on the earth has been changing, includ
2、ing the climate, however, its history is still a puzzle. 2. There are numerous man-made satellites(satellite) and asteroids floating(float) in the space. Some may crash onto the earth, and burn violently(violent) in the process. But most of them are harmless (harm), and some aerolites are of great v
3、alue for biologists to study aliens. Also, spaceship made by us should avoid hitting them. 3. There exist so many chemical factories that our homeland are seriously polluted. Therefore, if we dont take action in time, it will be difficult for us to save our land. 4. Once our playground was too small
4、, which prevented us from having enough space to play and exercise. Now, the new one is about three times larger than the old one, which even makes it possible for us to hold sports meetings. 5. There are billions of asteroids in the space. But we human beings are still puzzled about how they came i
5、nto existence. 微语段填空1. Now that we all understand (既然我们都明白)that the haze is harmful to our health, we should take effective measures to prevent it from (阻止它) getting bad to worse. No matter what happens, we must cheer up(振作) and try to reduce the pollution. If we keep on, well succeed in time(终将成功).
6、 2. A fire broke out in the building last night. Luckily, the firefighters arrived in time and put out the fire. We were warned to watch out for electricity and gas (注意电和煤气)when cooking our meals. Thanks to the firefighters help, we were not injured. They are the men that we can depend on (我们可以依赖的)w
7、hen we are in trouble. 3. Whether there is life on Mars is still a puzzle to us. The earth is four times the size of Mars (是火星的四倍大). Whether we can land on Mars depends on the development of science and technology. There is almost no oxygen on Mars and this makes it impossible for life to exist (使生命不可能存在). If we are to go to Mars one day, we should have to take along our own oxygen, food, clothing and shelter. 关闭Word文档返回原板块
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