2. 外语
  3. More teenagers smoke today than at any【C1】______ since the 1970s, a federal study shows. Overall, 35% of children in grades 9—12

More teenagers smoke today than at any【C1】______ since the 1970s, a federal study shows. Overall, 35% of children in grades 9—12

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问题      More teenagers smoke today than at any【C1】______ since the 1970s, a federal study shows. Overall, 35% of children in grades 9—12 smoke cigarettes, a greater 【C2】______ than 25% of adults who smoke.
    【C3】______ it is illegal to buy cigarettes until age 18, more than 75% of kids who 【C4】______  them in stores are not asked for proof of 【C5】______ , and they get cigarettes just as adults do: they walk in and buy them, 【C6】______ no one checks their age. At a high school 【C7】______ inaugurated a smoke-free campus this year, students who smoke cigarettes between classes 【C8】______ that stricter laws will cut 【C9】______ . Sixth and seventh-graders【C10】______ at a middle school say they have little trouble【C11】______ stores to sell them cigarettes, 【C12】______ unsupervised vending machines or getting 【C13】______ students to buy cigarettes for them. They say they have 【C14】______ the most successful store-buying line early: "My 【C15】______ is waiting in the car."
     【C16】______ smoking becomes less popular in adults, smoking becomes a form of rebellion. Too often the rebellion leads to the tragic consequences of a 【C17】______ smoking habit. Health experts warn that【C18】______ teen smokers quit soon, advances made in reducing lung and heart disease in the past 20 years will be 【C19】______ . This will have a dramatic effect on the nation’s 【C20】______  .
【C18】
选项 A、unless
B、lest
C、if
D、though
答案A
解析 此题考查连词用法。根据上下文判断，应该是“如果未成年吸烟者不很快戒烟，则会导致…”，因此只有A项为正确答案。
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