共用题干

共用题干
How the Body Keeps the Same Temperature

The temperature of your body should always be the same if you are fine,no matter whether the weather
is hot or cold.That is why the doctor tests your temperature with a thermometer when you are sick.Normally,
your body teniperature is ninety-eight point six degrees Fahrenheit.If it is_______(51)than that,it is a
stire sign that something is wrong with your body.
Your body keeps the same temperature all the time,because it balances the heat it produces and the
heat it_______(52)off. It is always burning up food and producing heat.It can produce heat faster
when the body needs or give off heat faster when the body becomes too warm.Let's see_______(53)
this works.
The heat of your body is given off chiefly through the skin.When you feel_______(54),your skin
is tight and shows"goose flesh".When you feel chilly,you must_______(55)around to keep warm.
_______(56)your muscles begin to work,bum up fuel and produce more heat.It is not_______(57)to
shiver,so you usually prefer warming up by taking exercise,or put_______(58)more clothes to keep
warm。
When you get warm,the skin is loose and soft. It is so supplied_______(59)blood that heat is giv-
en off rapidly. If you get too warm,you begin to sweat and_______(60)body heat is used in evaporating
the, moisture in your body.In warm_______(61)or warm rooms,you wear less clothing,
_______ (62)heat can be given off freely. You prefer less exercise because your body is warm_______(63),and
the extra heat produced by taking too much exercise makes you uncomfortable.
Now you see why you_______(64)differently in different kinds of weather. In summer,when it is
hot,you feel tired and lazy.You do not care to work or play,but enjoy lying down and doing nothing. When
you get out of door in winter,the cold air makes you feel_______(65).You want to run and play.

_________(61)
A:weather
B:climate
C:circumstance
D:environment