When skin is exposed to sunlight, especially the face, it becomes coarse(粗糙的). Wrinkled and discolored with a pale yellow tint, Yolanda's team wrote.

　　Several previous studies have found that cigarette smoking led to premature(过早的)skin aging as measured by facial wrinkles, the study said, but little has been done to measure the aging of skin not exposed to light.

　　The report did not discuss die mechanism involved but previous research has found that cigarette smoke, among other things, causes blood vessels(血管)beneath the skin to constrict(紧缩), reducing blood supply to the skin.

　　Smoking can also damage the connective tissue(组织)that supports both die skin and the internal organs.

　　32. The best title for this passage would be ______________.

　　A. The danger of smoking

　　B. Smoking causes skin aging

　　C. Quit smoking for health

　　D. A survey of smokers

　　33. According to the passage, how wrinkled a person’s skin is doesn’t relate to ___________.

　　A. the number of cigarettes a person smokes

　　B. the kind and characteristics of skin

　　C. how long a person smokes

　　D. how long skin is under sunlight

　　34. From the passage smoking results in skin aging mainly because ____________.

　　A. it will lower blood supply to skin

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