How the Body Keepsthe Same Temperature

The temperature ofyour body should always be the same if you are fine,no matter whether theweather

is hot or cold.Thatis why the doctor tests your temperature with a thermometer when you aresick.Normally,

your bodyteniperature is ninety-eight point six degrees Fahrenheit.If itis_______(51)than that,it is a

stire sign thatsomething is wrong with your body.

Your body keeps thesame temperature all the time,because it balances the heat it produces and the

heatit_______(52)off. It is always burning up food and producing heat.It canproduce heat faster

when the body needsor give off heat faster when the body becomes too warm.Let's see_______(53)

this works.

The heat of yourbody is given off chiefly through the skin.When you feel_______(54),your skin

is tight andshows"goose flesh".When you feel chilly,you must_______(55)around tokeep warm.

_______(56)yourmuscles begin to work,bum up fuel and produce more heat.It is not_______(57)to

shiver,so youusually prefer warming up by taking exercise,or put_______(58)more clothes tokeep

warm。

When you getwarm,the skin is loose and soft. It is so supplied_______(59)blood that heat isgiv-

en off rapidly. Ifyou get too warm,you begin to sweat and_______(60)body heat is used inevaporating

the, moisture inyour body.In warm_______(61)or warm rooms,you wear less clothing,

_______ (62)heat canbe given off freely. You prefer less exercise because your body iswarm_______(63),and

the extra heatproduced by taking too much exercise makes you uncomfortable.

Now you see whyyou_______(64)differently in different kinds of weather. In summer,when it is

hot,you feel tiredand lazy.You do not care to work or play,but enjoy lying down and doingnothing. When

you get out of doorin winter,the cold air makes you feel_______(65).You want to run and play._________(57)

A.glad

B.pleasant

C.surprising

D.polite