题目

When you’re climbing up a hill or playing sports,your back is all wet and so is your face.Why?Because you are sweating.  36  When your body gets hotter than that,your brain doesn’t like it.It wants your body to stay cool and comfortable.So the part of your brain that controls temperature sends a message to your body,telling it to sweat.Then sweat glands（腺）in your skin start making sweat.   37  They are all called pores（毛孔）academically.When the sweat hits the air,the air makes it turn from a liquid to a vapor.As the sweat leaves off your skin you cool down. Sweat i8.( 2014 天津，29) The book won’t       until the end of the year.   A. come out   B. come over   C. come true   D. come on