Only after my friend came .? A.did the computer repair? B.he repaired the computer? C.was the computer repaired? D.the computer was repaired 题目和参考答案——青夏教育精英家教网—

题目内容

Only after my friend came　　　　 .?

A.did the computer repair?　　　　　　　　　 B.he repaired the computer?

C.was the computer repaired?　　　　　　　　 D.the computer was repaired

本题考查倒装句。“only+状语”放在句首时，句子要用倒装语序。句意为：直到我的朋友回来后，电脑才修好。很明显computer与repair之间是被动关系，所以谓语动词要用被动语态。

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Besides giving off gases and dusts into the air, humans produce waste that is poured on the environment. Often, this waste produced by major industries and people is harmful to both nature and human life.

One of the main causes of the large amount of dangerous waste is that people do not realize how large a problem it is. Because it can be simply removed and sent to a landfill(废渣填埋场),the problem is often believed to end there. In addition, industries have often shown an unwillingness to find ways to deal with dangerous waste because of the related expenses. Many industries and governments build simple landfills to store waste, and often just pour waste chemicals into nearby bodies of water. Often, chemicals used for industrial production cause dangerous forms of waste.The amount of these chemicals has increased greatly in the past, but it is often difficult and expensive to get rid of these chemicals or to store them in a way safe to human life and the environment.

Every year, major health problems result from dangerous waste. Sadly, it is often only after someone has died or become seriously ill that governments will take measures to reduce levels of harmful waste.

Some governments have realized how serious the dangerous waste problem is and are now trying to settle this problem. They are also trying to limit the amount of waste industries are allowed to produce.

Not only governments but ordinary people as well must work together to solve the problem. They can choose not to buy those products which require the production of dangerous waste, and produce less harmful waste themselves. Many scientists think that waste production can be cut. The waste can be reduced by at least one third using existing technologies and methods.

1.What would be the best title for the text?

A．Measures of Reducing Dangerous Waste

B．Danger of Harmful Waste to Mankind

C．Dangerous Waste and Water Pollution

D．Environmental Protection

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B．do not know where to place the dangerous waste

C．are not clear about how serious the dangerouswaste problem is

D．are not sure about where harmful waste ends

3.What troubles industries most in dealing with the dangerous waste problem?

A．How to get government support.

B．How to increase their production.

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D．How to cut down the related costs.

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A．The polluting industries are not allowed to sell their products.

B．Present technologies have settled the harmful waste problem.

C．Everyone should obey the government rules for the problem.

D．To solve the problem requires the efforts of the whole society.

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In recent years, an increasing number of teenagers have the problem of obesity（肥胖）. This problem shouldn’t be ignored. It’s harmful disorder that can cause a number of health problems in children.

Many factors in life play an important role in developing obesity among teenagers. Generally, obesity happens when a Person uses more calories than he burns up. A child of fat parents is at higher risk to develop obesity. If both the parents are overweight, then there are 80% chances of developing obesity in children. Also, poor eating habits and lack of exercise can develop obesity in teenagers.

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Obesity among teenagers can be treated by changing diets, increasing physical activities and taking certain medicine. Foods containing fats and high calories should be strictly removed from their diet. However, you should be careful that teenagers should get enough nutrients required for a healthy growth through their diet. You should make sure the children join in more physical activities and exercise. In some severe cases, the drugs should be given only after seeing the doctor.

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