Passage 14

　　The whole body is covered with skin. The surface of the skin is dead(like the hair and the nails) ,but it is made from a living layer(层)just under the surface. The outside dead layers wear off(磨损)all the time, with new ones replacing them, and the body forms a totally new skin every three weeks.

　　The skin protects the body from the outside world and it passes information from the outside. It helps to keep water in the body and to keep the body at the same temperature. Bacteria (细菌) can’t get in through the skin unless it is damaged.

　　If the weather is cold, the blood vessels (血管) in the skin squeeze down, or contract(收 “tan”(晒黑) in the sun. This happens when the body produces extra colour cells in the skin for protection. In the sun, the skin produces a vitamin (vitamin D) which is needed for strong bones.

　　1

　　Which of the following statements is NOT true?

　　A. Our hair and nails are dead like the surface of the skin.

　　B. There is skin all over our body.

　　C. The skin of our bodies will be completely different in three weeks.

　　D. The surface of the skin is made of a living layer.

　　答案:D

　　2

　　The second paragraph mainly tells us about __

　　A. the functions of the skin

　　B. the information from the outside

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