题目内容：

    Tobacco has long been recognized as a huge health threat. It is known to cause lung and heart problems to many long-term users. According to the World Health Organization, 3,000,000 people die early each year because of tobacco use, including 890,000 deaths from second-hand smoke exposure.

E-cigarettes, an alternative (替代品) to smoking, have become popular. Also known as vaporizers (汽化器), they are electric devices that heat liquid nicotine into a vapor that can he taken in. This vapor is less harmful to inhale than smoke. For example, it does not produce tar (焦油), which can build up in a smoker’s lungs. Inhaling vapor - called vaping - is not without its own risks, however. Exposure to nicotine during youth can lead to addiction and cause long-term harm to brain development. The vapor may also contain harmful things. The Center for Disease Control has linked vaping to more than 805 cases of lung disease and 12 deaths so far in the US.

Vaping has greatly increased in popularity in the US, especially among teenagers. About 37 % of US high school seniors were reported vaping in 2018, up from 28% the year before, Harvard Health Publishing reported. Michael Blaha, a researcher at the Johns Hopkins Ciccarone Center for the Prevention of Heart Disease, listed 3 reasons that contributed to vaping’s popularity among young people. First, many teens eve that vaping is less harmful than smoking. Second, ecigarettes have a lower per-use cost than traditional cigrattes. Finally, e-cigarettes come in a wide range of sweet flavors, like apple pie and watermelon.

Blaha is most concerned that more teenagers are taking up vaping as a habit. “It’s one thing if you change from cigarette smoking to vaping. It’s quite another thing to start up nicotine use with vaping. And, it often leads to using traditional tobacco products down the road,” he said.

Governments around the world the divided about vaping. 39 countries and regions have banned the sale of e-cigarettes, according to the Global State of Tobacco Harm Reduction 2018. Last September, US President Donald Trump said the use of e-cigarettes might be negatively affecting young people and that it should be kept off the market until proved harmless.

1.The underlined word “inhale” in Paragraph 2 probably means “__________”.

A.blow away B.spread out

C.give off D.breathe in

2.In what way are e-cigarettes different from traditional tobacco products?

A.E-cigarettes do not produce tar.

B.E-cigarettes are not bad to smokers’ health.

C.E-cigarettes are less likely to cause nicotine addiction.

D.E-cigarettes do more harm to smokers’ brains than their lungs.

3.Why is vaping popular with young people according to Blaha?

A.Vaping is allowed at school.

B.Vaping makes them look cool.

C.They like the liquid taken from fruits.

D.They think it’s safer and cheaper than smoking.

4.What can we learn from Blaha’s words in Paragraph 4?

A.Those who smoke e-cigarettes tend to smoke tobacco later.

B.Vaping is more likely to attract teenagers than older people.

C.It usually takes a long time for smokers to enjoy e-cigarettes.

D.E-cigarettes should be encouraged to replace traditional tobacco products.