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.

　　1. 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

　　2. 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

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

　　A. it will lower blood supply to skin

　　B. it can make you feel tired

　　C. it can make skin come off

　　D. it can make blood run faster

　　4. The main purpose of the passage is to ____________.

　　A. inform people about the study of skin

　　B. advise people how to protect skin

　　C. warn people not to smoke again

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