A. at which B. take up C. positive Phrases: A. never to【T7】______smoking to begin with B. which is a【T8】______sign C.【T9】______

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问题 A. at which B. take up C. positive
Phrases:
A. never to【T7】______smoking to begin with
B. which is a【T8】______sign
C.【T9】______the person begins to smoke
    Quitting smoking is more of a matter of willpower than of individual choice, for smoking is widely recognized as a hard habit that takes great determination and efforts to get rid of once picked up. Despite the chance that a smoker can quit permanently through medication or doctors’counseling, the best way to avoid the trouble is【T10】______
    The hard-to-stop effects of cigarette smoking vary in intensity and are related both to the amount and length of exposure and the age【T11】______Cigarette smoking is presently blamed for one-third of all cancer deaths in the United States. The sad fact is that more people take up smoking than give it up and that the demonstration of the potential risks caused by smoking can fail, particularly among the young and in face of the vigorous marketing of cigarette manufacturers. Smoking is banned in public places in some big cities,【T12】______that the awareness of the harm of cigarette smoking has been strengthened.
【T8】

选项 A、 
B、 
C、 

答案C

解析 根据空格前的冠词a和空前后的名词sign可知,此处需填入一个形容词。positive是形容词,修饰名词sign。故选C。
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