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  3. Smoking has become socially unacceptable in the US, in part due to the health risks. Smoking is prohibited in government and pub

Smoking has become socially unacceptable in the US, in part due to the health risks. Smoking is prohibited in government and pub

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问题     Smoking has become socially unacceptable in the US, in part due to the health risks. Smoking is prohibited in government and public buildings, and many businesses, especially res【76】, will not permit smoking on the premises. Those restaurants that p【77】smoking will usually have a separate section for customers who sin【78】. Your school probably has a ban on smoking within c【79】buildings or near building entrances.
    Tobacco products may not be sold to anyone under 18 years old, and federal law re【80】stores to ask to see a photo 1D for anyone un【81】27 years old.
    If you are a guest in someone’s home, you should ask whether it is ok to smoke before l【82】up. If there are no ashtrays in the house, it is a good sign t【83】smoking is not ac【84】.
    Smoking on airplane flights within the US is pro【85】. There are severe penalties for smoking on an airplane or in an airplane lavatory. Smoking is a【86】prohibited on interstate trains and buses.
    Smoking is prohibited on public transportation, i【87】buses and trolleys.
    Smoking around children is inappropriate. Buying cigarettes for a child or giving a child a c【88】is illegal.
    It is extremely imp【89】to blow smoke in someone’s face.
    If you are smoking and someone co【90】, it is often a polite way of asking you to extinguish the cigarette.
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答案that
解析 此处应为that引导同位语从句，作sign的同位语。
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