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  3. The nicotine gum and patches are often used by millions of smokers to help kick their habit. But they have no lasting benefit an

The nicotine gum and patches are often used by millions of smokers to help kick their habit. But they have no lasting benefit an

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问题     The nicotine gum and patches are often used by millions of smokers to help kick their habit. But they have no lasting benefit and may backfire in some cases, according to the most【B1】______long-term study to date of so-called nicotine replacement therapy.
    The study, published Monday in the【B2】______Tobacco Control, included nearly 800 people trying to quit smoking over a period of several years, and is likely to intensify a long-running debate about the value of nicotine【B3】______.
    The market for nicotine replacement products has taken off in recent years, rising to more than $ 800 million annually from $ 129 million in 1991. The products were【B4】______over-the-counter sale in 1997, and many state Medicaid programs cover at least one of them.
    In medical studies, the products have proved【B5】______, making it easier for people to quit, at least in the short term. Those earlier, more encouraging findings were the basis for federal【B6】______that recommended the products for quitting smoking. But in surveys, smokers who have used the over-the-counter products have reported little benefit.
    Doctors said that the study findings were not unexpected, given the occasional way many smokers used the products. "Patient【B7】______is a very big issue," said Dr. Richard Hurt, director of the Nicotine Dependence Center at the Mayo Clinic, who was not【B8】______the study.
    The researchers argue that while nicotine replacement appears to help people quit, it is still not enough【B9】______Motivation matters a lot; so does a person’s social environment, the amount of support from friends and family, and the rules【B10】______at the workplace.
【B8】
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解析 被动语态题。分析句子结构可知此处缺少谓语成分，根据空格前的was判断可能会涉及被动语态。根据上下文，此处意在表达这名专家并没有“参与”这项研究。结合录音，填入involved in。
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