Different weather makes people feel different. It influences health, intelligence 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 heart problems in this month. In the northeast and the Middle West, it is very hot at some times and very cold at other times. People in this 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, the IQs of a group students were very high when a very strong wind came, but after the strong wind, their IQs were 10% lower. The wind can help people have higher 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 in these months. They might feel unhappy in 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 in shops on low-air-pressure days. There is a “ good weather ” for intelligence and health. People feel best at a temperature of about 18℃.
   Are you feeling sad, tired, forgrtful, or unhappy today? It may be the weather’s problem.
48. The underlined word “ intelligence ” in this passage means       in Chinese.
  A. 财富          B. 记忆         C. 智力            D. 生活
49. From the passage, we can learn that people may be ill more often when       .
  A. the weather is hot and wet          B. the weather changes greatly
  C. the weather is warm               D. the weather is always cold
50. Which of the following is TRUE according to the passage?
  A. Thin people might feel tired in cold weather.
  B. Fat people may feel hard at about 18℃.
  C. A person may have a worse memory on a high-air-pressure days.
  D. Students in America often do worse in exams on very hot days.
51. The passage most probably comes from      .
  A. a newspaper                          B. an advertisement
  C. a travel magazine                      D. a story book
47. B            48. C            49. B              50. D
51. A