2. 外语
  3. Health experts have warned 【B1】 many years that smoking can 【B2】 to heart disease, cancer and 【B3】 medical problems. And officia

Health experts have warned 【B1】 many years that smoking can 【B2】 to heart disease, cancer and 【B3】 medical problems. And officia

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问题     Health experts have warned 【B1】 many years that smoking can 【B2】 to heart disease, cancer and 【B3】 medical problems. And officials say diseases caused directly 【B4】 smoking kill at 【B5】 320,000 Americans each year. But smokers still find 【B6】 difficult to stop. The tobacco industry 【B7】 40 million Americans continue to smoke.
    Each year the American Cancer Society 【B8】 a national Non-Smoking Day in an 【B9】 to get people to give 【B10】 cigarettes. On that day the officers from the Society will 【B11】 telephone call advice on 【B12】 to stop smoking. Smokers 【B13】 can call a special telephone number to 【B14】 recorded messages by doctors. Some business will 【B15】 their workers candy or chewing gum to help them to keep 【B16】 smoking. Some companies are offering special gifts and prizes to 【B17】 who sign an agreement to stop smoking. And Amerioans 【B18】 do not smoke are being asked to help 【B19】 one person who is smoking during the 24 【B20】  campaign.
选项 A、since
B、for
C、of
D、against
答案B
解析 for用来表示一段时间，常与完成式配合使用。
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