Unit 13 We're trying to save the earth! 知识点题库
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（1） She has already finished her homework. (改为否定句)
She her homework .
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（2） He made me do homework for him.（改为被动语态）
I was made homework for him.
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（3） Gina's never been to the Great Wall.（完成反义疑问句）
Gina's never been to the Great Wall, ?
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（4） The river used to be so clean.（改为一般疑问句）
the river to be so clean?
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（5） The little boy bought the toy car two days ago. (改为同义句)
The little boy the toy car for two days.
Pollution inside homes and other buildings kills more than 4 million people each year. Many people die as a result of breathing smoke or from cooking over wood-powered or coal-powered stoves.
One way to reduce the number of deaths is through cooking equipment powered by the sun. Crosby Menzies, a solar power expert in a South African company, described his latest solar cooker called the "Sol-4". "It is four square meters of mirrors, six to eight meters in length. It is quite a large cooker. "
The "Sol-4" works by reflecting (反射) light from the sun off large mirrors. The mirrors direct (把……对准) the light at a cooking pan. Then the light heats the pan with solar energy. Within two minutes, the pan is hot enough to cook sausages and onions. In just four minutes, water can be boiled. That is as fast as cooking with natural gas or electricity.
The cooker is also much "friendlier" than other models because people do not have to stand in the sun to use it. And people can prepare meals without having to collect firewood or spend money on coal. Such individuals would be less likely to have breathing illnesses from harmful smoke.
At present, the cooker only works when the sun is shining. But engineers are working on a way to make it work without sunlight.
Each cooker costs about $ 2,000, which is a large amount of money for most Africans. To solve that problem, Crosby Menzies has created a non-governmental organization called Solar Cookers for Africa. It plans to raise money through donations to provide poor people with solar cooking equipment.
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（1） This passage is mainly about .A . solar cookers B . smoke pollution C . solar power experts D . breathing illnesses
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（2） The "Sol-4" is mainly used to .A . shorten the time of cooking B . reduce the cost of making cookers C . raise money through donations to help African people D . reduce the number of deaths caused by harmful smoke
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（3） The underlined word “individuals” most probably means “ ”A . cookers B . mirrors C . people D . experts
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（4） Which of the following about the "Sol-4" is TRUE?A . It is six to eight square meters of mirrors. B . It can work in any weather condition now. C . It can also heat the pan by lighting firewood. D . It is more environment-friendly than other cookers.
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（5） From the passage, we can infer that .A . the "Sol-4" will be designed in a smaller size B . more Africans can use the solar cookers in the future C . the "Sol-4" is the first product of the South African company D . the African government will provide poor people with solar cookers
—In Guizhou China.
throw away, pull……down, put…… to good use, bring back, be made of |
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（1） The waste bottle can , for example, we can use them to build a house.
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（2） The old man asked us how much food we into the garbage this morning,
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（3） The old building and they wanted to build a new one here.
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（4） You know that a button early bones, wood, glass, or plastic.
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（5） Mike said the next day he my book that he borrowed from me last week.
—I just __________ten dollars for it.
Carl this outdoor activity with Katie.
Your help has .
Pollution
Hundreds of years ago，life was much harder than it is today. People didn't have modern machines. There was no modern medicine，either.
Life today has brought new problems. One of the biggest is pollution. Water pollution has made our rivers and lakes dirty. It kills our fish and pollutes our drinking water. Noise pollution makes us talk louder and become angry more easily. Air pollution is the most serious kind of pollution. It's bad to all living things in the world.
Cars，planes and factories all pollute our air every day. Sometimes the polluted air is so thick that it is like a quilt over a city. This kind of quilt is called haze (雾霾).
Many countries are making rules to fight against pollution. Factories must now clean their water before it is thrown away，and they mustn't blow dirty smoke into the air.
We need to do many other things. We can put waste things in the dustbin and not throw it on the ground. We can go to work by bus or with our friends in the same car. If there are fewer people driving，there will be less pollution.
Rules are not enough. Every person must help to fight against pollution.
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（1） Hundreds of years ago, life was much harder than it is today because________.A . there were not any modern machines B . there was no modern medicine C . both A and B D . there were not many people
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（2） What is the biggest problem in today's life?A . Water pollution. B . Air pollution. C . Noise. D . Pollution.
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（3） The most serious kind of pollution is________.A . noise pollution B . air pollution C . water pollution D . A，B and C
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（4） Factories must clean their water________.A . before they are thrown away B . when they are thrown away C . after it is thrown away D . before it is thrown away
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（5） From the passage we know that________.A . a few years ago, there was no haze at all B . today people don't have to talk to each other in a loud voice C . we can drink water from the polluted rivers and lakes D . people are making rules in order to fight against pollution
