18．
Very hot weather is common in many parts of the world．A1though hot weather just makes most people hot，it can cause medical problems--and death．
Floods，storms and other terrible natural events kill thousands of people every year．And，we hear much about them in news reports．We generally hear little about heat，which experts say may be nature's most dangerous killer．
Health experts say that since the year 1900，very hot weather has killed more people in the United states than any other natural event．One year-the unusually hot summer of 1980 heat caused about 1，700 deaths in the United states．In 1995，more than 600 people died in another heat wave in one city-Chicago．Illinois．
Besides drinking lots of Cool water，doctors say there are other things to do to protect against the health dangers of heat．Stay out of the sun，if possible．Wear loose（宽松的），lightweight and light一colored clothes．Wear a hat while in the sun．Eat fewer hot and heavy foods．And，when possible，cook foods during cooler time of the day．If possible，rest more often．
Health experts say that these simple steps can prevent（阻止） the dangerous health problems caused by heat．They will prevent sickness，help you feel better and may even save your life．
61．Hot weather is commonB．
A．all over the world B．in lots of parts of the world
C．in most parts of the world D．in few parts of the world
62．Experts say maybeA is natural's most dangerous killer．
A．heat B．a flood C．a storm D．an earthquake
63．About 1，700 people died of heat in the USB．
A．in 1900 B．in 1980 C．in 1995 D．in 2000
64．Acoording to the passage，there areBsteps which are mentioned to stop the dangerous health problems caused by heat．
A.6 B.7 C.8 D.9
65．The passage is talking aboutD．
A．all kinds of terrible natural events in the world
B．some health problems caused by hot weather
C．how to prevent and treat health problems
D．the health problems in hot weather and the ways to prevent them．
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