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The temperature of your body should be always just the same,no matter whether the weather is hot or cold. That is why the doctor uses his thermometer (温度计) when you are sick. When you are well,your temperature is about 37^. If he finds it higher than that,it is a sure sign that something is wrong.

The body keeps the same temperature all the time,because it balances the heat it produces and gives off. It is always burning up food and producing heat. It will produce heat faster when it needs to,and give off heat faster when it is too hot. Let's see how this happens.

The heat of your body is given off chiefly through the skin. When you are cold,your skin is tight and shows " goose flesh". At this time you usually prefer warming up by exercise,or put on more clothes to keep heat in.

When you are hot,the skin is loose and soft. It is supplied with more blood,and the heat is given off rapidly. If you are very hot,you begin to sweat. In this way,more body heat is given off from your skin. You wear less clothes,too,so that the heat can be given off freely. You may not want to exercise at this moment because your body is hot already,and the extra heat produced by exercise makes you uncomfortable.

You will feel differently in different kinds of weather as well. In summer,when it is hot,you feel tired and lazy. You do not want to work or play,but enjoy lying down and doing nothing. But when you get out of doors in winter,the cold air makes you feel lively. You want to run and play.

(   ) 11. Doctors take a patient's temperature to see         .

   A. whether a person is ill or not

   B. if the patient's skin is loose or soft

   C. what the weather is like

   D. whether a person feels hot or cold

(   ) 12. How does the body keep the same temperature all the time?

   A. It balances the heat it gets and loses.

   B. It gives off the heat produced in it.

   C. It is always producing heat from food.

   D. It stops producing heat when necessary.

(   ) 13. When one feels too hot,he begins to sweat in order to         .

   A. produce more water

   B. give off heat quickly

   C. make the skin soft and loose

   D. get the blood to move faster

(   ) 14. We feel differently in different kinds of weather because .

   A. our body temperature is always changing with the weather

   B. warm weather makes us feel lazy and cold one makes us active

   C. we are moody according to the changes of temperature

   D. our bodies react differently to keep the same temperature

(   ) 15. We can read this article         .

   A. in a history look

   B. on a medicine bottle

   C. in a science book

   D. in an advertisement

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