1. (4分)According to the national survey by the CDCOSH, we can know that less than 3 million kids between the ages of 12 and 17 are lighting up.

1.
(4分)According to the national survey by the CDCOSH, we can know that less than 3 million kids between the ages of 12 and 17 are lighting up.

出自：兰州大学大学英语（3）

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