No man can change the weather．But if we read the sign(标志)correctly, we can 　　1　　 what the more important changes in the weather will be．This way of telling what the weather will be like 　　2　　 the following days is 　　3　　 weather forecasting(天气预报)．People who do this are not making the weather．They are only using their knowledge of the 　　4　　 today to tell us what the weather may be 　　5　　　　　6　　．We all understand how important this is．　　7　　 useful it is if the farmers know in advance(事前)whether it is going to rain or not．If they know in advance, they can make plans to fit in with(适应)the weather．They know when to plant and when not to plant, when to collect(收割)and when not to collect crops．

　　Not only farmers 　　8　　 scientists have studied weather forecasting．People for many centuries and 　　9　　 all countries have studied the weather and tried to 　　10　　 weather forecasts．

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　　Different weather makes people feel different．It influences ① health, intelligence ② 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 every 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 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 ③．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 18C, people become stronger．

　　Low air pressure ④ may make people forgetful．People leave more bags on buses and in shops on low-pressure days．There are a "good weather" for word and health．People feel best at a temperature of about 18 centigrade ⑤)．

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

　　①影响　②智力　③天气对人的情感的影响也很大。　④气压　⑤摄氏度

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