A. Two.

　　B. Four.

　　C. Three.    D. Five. 62. Whether water vapour can be seen or not depends on _______.

　　A. how much water is evaporated

　　B. how good your eyes are

　　C. in which way water is evaporated   

　　D. climate or weather 63. From the passage we get to know _______.

　　A. there is more water vapour in the air in the tropics than in cold polar regions

　　B. there is more water vapour in the air in cold polar region than in the tropics

　　C. it gets more rain in the tropics than in cold polar regions because there is less vapour

　　D. the amount of water vapour in the air depends on how often it rains

　　C

　　CHICAGO (Reuters) - Smoking not only can wrinkle(起皱纹) the face and turn it yellow -- it can do the same to the whole body, researchers reported on Monday.

　　The study, published in the Archives of Dermatology, shows that smoking affects the skin all over the body -- even skin protected from the sun.

　　"We examined non-facial skin that was protected from the sun, and found that the total number of packs of cigarettes smoked per day and the total years a person has smoked were linked with the amount of skin damage a person experienced," Dr. Yolanda Helfrich of the University of Michigan, who led the study, said in a statement.

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