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In August, it is very hot and wet in the southern part (南部) of the US. People there easily have heart trouble (心脏病) and other kinds of health problems (健康问题) during this month. In the Northeast (东北部) and the Middle West (中西部), people have heart trouble after the weather changes in February or March.

The weather can also influence (影响) intelligence (智力). For example, in a 1983 study, the IQ scores (分数) of some students were very high during a storm, but after the storm, their scores were low. Very hot weather, on the other hand, can decrease (减少) it.

Weather also influences people’s feelings. Winter may be a bad time for thin people. They usually feel cold during these months. They might feel depressed during cold weather and don’t want to do anything.

Low air pressure (气压) makes people feel free, but it also increases forgetfulness. People leave more bags and umbrellas on buses and in stores on low pressure days. There is “perfect weather” for work and health. People feel best at a temperature of about 64°F with 65 per cent humidity (湿度).

1．American people _______ may easily have heart trouble. (       )

A．in the southern part in August	B．in the northern part in July
C．in the Middle West in July	D．in the Northeast in August

2．Intelligence may be lower _______. (       )

A．during a storm

B．on a very hot day

C．when it is sunny

D．before the storm

3．The underlined word “depressed” in Paragraph 3 means “_______”. (       )

A．兴奋的

B．忧郁的

C．愉快的

D．担心的

4．In “perfect weather”, _______. (       )

A．both the fat and the thin are healthy

B．the students do very well in exams

C．the air pressure is low

D．the humidity is 65% and the temperature is about 64°F

5．Weather influences people’s _______. (       )

A．health

B．intelligence

C．health and intelligence

D．health, intelligence and feelings