单选题：What do we learn about e-cigarettes?

  • 题目分类：英语四级
  • 题目类型：单选题
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题目内容：

What do we learn about e-cigarettes? A．They contain the chemical matters identical with tobacco．
B．They have strong ties with drinking among teenagers．
C．They act as an approach to tobacco cigarette use．
D．They are available in the grocery stores．

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