The most common medical problem caused by hot weather is heat stress.Usually,it also is the least severe.For most peoople,the only result of heat stress is muscle pain.The pain is a warning that the body is becoming too hot.Doctors say drinking water will help the pain disappear after the body again has the right amounts of water and salt.For some people,however,the result is much more serious.
For example,doctors say some people face a greatly increased danger from heat stress.These people have a weak or damaged heart,high blood pressure,or other problems of the blood system.Severe heat can help cause a heart attack or stroke.Health experts say this is the most common cause of death linked to hot weather.
31.How many people died from heat in Chicago in 1995?
A.About 1700.
B.Nearly 1900.
C.Around 1100.
D.Over 600.
32.What can people learn from the Mean Heat Index?
A.The average temperature of an extremely hot day.
B.The highest temperature of an extremely hot day.
C.The lowest temperature of an extremely hot day.
D.The nighttime temperature of an extremely hot day.
33.A heat wave is a period of time during which
A.the weather is much better than usual.
B.the nights are much longer than usual.
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