Heat Is KillerExtremely hot weather is common in many parts of the world.Although hot weatherjust makes most people feel hot,it can_______(51)serious medical

problems-evendeath.Floods,storms,volcano eruptions and other natural______(52)kill thousandsof people every year.

So______(53) extremeheat.Experts say heat may be nature's deadliest killer, Recently,extreme heatwas blamed ______(54)killing more than one hundred people in India.It

is reported that thetotal heat of a hot day or several days can______(55)health.Several hot daysare considered a heat wave.

Experts say heatwaves often become dangerous when the nighttime temperature doesnot_______(56)much from the highest daytime temperature.This causes greatstress on

the human body.

Doctors say peoplecan do many things to______(57)themselves from the dangers of extreme heat.Stay out of the sun,if possible.Drink lots of cool water.Wear light colored

clothingmade______(58) natural materials;avoid wearing synthetic clothing.

Make sure theclothing is______(59),permitting freedom of movement.

And learn thedanger______(60)of the medical problems,such as headache and vomiting,that arelinked to heat.Most people suffer only muscle pain as a(n)______(61)of heat

stress.The fiain isa______(62)that the body is becoming too hot.Doctors say those sufferingheadache or muscle pain should stop all activity,rest in a cool place and drink

cool liquids.Do notreturn to physical _______(63)for a few hours because more serious conditionscould develop.

Doctors say somepeople face an______(64)danger from heat stress.Such persons have a weak ordamaged heart,high blood pressure,or other problems of the blood system.

Hot Weather alsoincreases dangers for people who must take______(65)for high blood pressure,poor blood flow,nervousness or depression.57._________

A.keep

B.stop

C.protect

D.prevent