题型：语法填空（语篇） 题类：常考题 难易度：困难
江苏省海安市2020-2021学年高二上学期英语期中考试试卷
When talking about our bodies, we often forget our skin. Actually, our skin is very important, too. It keeps us(inform) of the outside world--it is hot or cold, wet or dry.
Try this: pull up the skin from the back of your hand and then let go. What happens?
The skin goes back to its first position, which means that skin is elastic (有弹性的).
Our skin seems to be very thin, but it (make) up of two layers. The top layer is the one we wash every day. Do you know that this part of skin is dead? However, it is still very important because it serves as (protect) against dirt and disease.
Skin has millions of tiny holes called pores(毛孔). Pores allow liquid, especially sweat,(pass) through. By (sweat), our bodies keep up a normal temperature. When it is very hot, we sweat a lot, but(strange) enough, when it is quite cool, we also sweat. On a cool day, our bodies produce average of 700 ml of sweat. That is(much) than 0.5 kilos.
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