阅读理解。阅读下列材料，从A、B、C、D四个选项中选出最佳答案。

　　Different weather makes people feel different．It influences health, intelligence(智力)and feelings．

　　In August, it is very hot and wet in the southern part of the United States．People there have heart trouble and other kinds of health problems during this month．In the Northeast and the Middle West, it is very hot at some times and very cold at other times．People in these states have more heart trouble after the weather changes in February or March．

　　The weather can also influence intelligence．For example, in a 1983 report by scientists, IQ(智商)of a group students were very high when a very strong wind came, but after the strong wind, their IQ was 10％ below．The wind can help people have more intelligence．Very hot weather, on the other hand, can make it lower．Students in many schools of the United States often get worse on exams in the hot months of the year(July and August)．

　　Weather also has a strong influence on people's feelings．Winter may be a bad time for thin people．They usually feel cold during these months．They might feel unhappy during cold weather．But fat people may have a hard time in hot summer．At about 18℃, people become stronger．

　　Low air pressure may make people forgetful．People leave more bags on buses and in shops on low-pressure days．People feel best at a temperature of about 18℃．

　　Are you feeling sad, tired, forgetful, or unhappy today? It may be the weather's problem．

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(阅读理解)

At one time, the only danger on the roads was from wild animals. Now the roads are full of cars, trucks and buses. These vehicles are as dangerous as the wildest animals. Every day people are killed while crossing the roads. Most of these people are old people and children. Old people are often killed because they usually cannot see or hear very well. Children are often killed because they are careless. They forgot to look and listen before they cross the roads. A car, truck or bus cannot stop very quickly. If the car is going very fast, it travels many meters before it stops. Walkers don’t always understand it. They think a car can stop within a few meters. The faster a car is traveling, the longer it takes to stop. It is very difficult for people to know how fast the cars is traveling. He may think it is going slowly. The only safe way to cross the roads is to look both ways, right and left. Then if the roads are clear, it is safe to cross. It’s not safe to run when they cross the roads.

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阅读理解

　　Every year several thousand people are killed on the road in Great Britain．Every year between one and two hundred people are hurt．These people are killed or hurt in road accidents．

　　There are rules to make the roads safe, but people do not always obey the rules．They are careless．If everybody obeys the rules, the roads will be much safer．How can we make the roads safe?

　　Remember this rule．In Great Britain traffic keeps to the left．Cars, buses and bikes must all keep to the left side of the road．In most other countries traffic keeps to the right．

　　Before crossing the road, stop and look both sides．Look right and left then．If you are sure that the road is clear, it is safe to cross the road．If you see small children or very old people, help them to cross the road．We must teach young children to cross the road safely．We must always give them a good example．Small children must not play in the street．

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