3. (4分)Despite laws designed to keep cigarettes away from kids, 15 percent of U.S. high school students and 34 percent fo middle school students use tobacco products, fovernment health officials say.

3.
(4分)Despite laws designed to keep cigarettes away from kids, 15 percent of U.S. high school students and 34 percent fo middle school students use tobacco products, fovernment health officials say.

出自：兰州大学大学英语（3）

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