8. To keep healthy,I decide (exercise) half an hour every day.

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B 

Different weather makes people feel different.

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The weather can also influence intelligence. For example,in a 1983 report by scientists,IQ(智商) of a group of students was very high when a very strong wind came,but after the strong wind,their IQ was 10% lower. 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 in exams in the hot months of the year (July and August) .

The 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 hard time in hot summer. At about 18°   C. people feel more comfortable.

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