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Smoking isn’t as cool as it used to be. The number of adult smokers in the U.S. is at the lowest level, according to new federal data. A recent report from the Centers for Disease Control and Prevention says almost a million fewer middle and high school students used tobacco products in 2017 than in 2011. But electronic cigarettes which contain nicotine are used by more and more people, which raises new issues.

According to the latest statistics, 3.2% of U.S. adults (about 7.5 million) said they used e-cigarettes, and it’s even more common among teens. Nearly 12% of high school students use e-cigarettes. They especially favor Juul, the brand that dominates the U.S. market.

It’s still unclear whether e-cigarettes are safe. Their aerosols often contain fewer harmful chemicals than smoke from burned tobacco, but they may still expose users to toxins. Many contain addictive nicotine, and whether they help smokers give up the habit is still a question. Some studies have also shown that kids who use e-cigarettes may be more likely to use other tobacco products.

The Food and Drug Administration has forbidden youth use. In April, the agency sent letters to retailers warning them against illegally selling e-cigarettes to underage users and asked makers to submit information on marketing practices. Juul, which says its devices aren’t for children, has promised $30 million over three years to stop the flow of its product to teens.

The risks of e-cigarettes remain unclear, but it is a trend that’s unlikely to flame out.

1.What’s the Chinese meaning of the underlined word “addictive” in Paragraph 3?

A 有害的.

B 让人放松的.

C 易上瘾的.

D 迷惑的.

解析：选C。词义猜测题。根据第三段...and whether they help smokers give up the habit is still a question中的give up可知电子烟应该是“易上瘾的”，故选C。

2.What is Juul according to the passage?

A A smoker.

B A student.

C An e-cigarette product.

D A tobacco businessman.

解析：选C。细节理解题。根据第二段They especially favor Juul, the brand that dominates the U.S. market.可知Juul是美国的一种主导电子烟品牌，故选C。

3.What can we know from the last paragraph?

A E-cigarettes are of no risk.

B People know the risks of e-cigarettes.

C Electronic cigarettes will gradually disappear.

D E-cigarettes are in great demand.

解析：选D。推理判断题。根据最后一段The risks of e-cigarettes remain unclear, but it is a trend that’s unlikely to flame out.可知，电子烟的风险尚不清楚，但吸食电子烟这一趋势恐很难消失，故选D。

4.What attitude should we take to e-cigarettes?

A E-cigarettes will replace traditional tobacco.

B E-cigarettes help people give up smoking.

C We should be cautious about using e-cigarettes.

D Cigarettes are harmful including e-cigarettes.

解析：选C。观点态度题。文中对电子烟的安全、风险等进行论述，结果尚不清楚，因此，我们对其应持谨慎、警惕的态度，不可盲目接受或是拒绝，故选C。

5.What’s the main idea of this passage?

A More adults in the US are smoking.

B More American teens prefer e-cigarettes.

C Tobacco raises new issues in the US.

D The US government is trying to stop e-cigarettes.

解析：选B。主旨大意题。文章主要讲了美国青少年吸食电子烟的大致情况，随着电子烟市场的不断扩大，电子烟也正成为一种新的吸烟方式，故选B。