About half of the 4,611 adults who took part in the survey had heard about e-cigarettes，which are battery-powered，or rechargeable cigarettes that vaporize a liquid nicotine solution．They do not produce smoke but a water vapor without smell．Sold mostly on the Internet，e-cigarettes were first made in China．

　　Last year the World Health Organization (WHO) warned against using e-cigarettes，saying there was no evidence to prove they were safe or helped smokers break the habit．The WHO said people who smoke e-cigarettes breathe in a fine fog of nicotine into the lungs．

　　Nearly a third of people questioned in the survey think that e-cigarettes should be allowed in places where smoking is forbidden，because they don’t produce smoke，but 46 percent disagree．Men who were aware of the availability of e-cigarettes were more likely than women to say they should be a choice available to smokers who want to quit．Young people，aged 18－29，and singles were the groups most open to trying e-cigarettes．Smoking is the single largest cause of preventable death worldwide，according to the WHO．

　　1．What can we learn from Paragraph 1?

　　A．American smokers ought to try e-cigarettes．

　　B．Americans have different opinions about e-cigarettes．

　　C．Every kind of cigarettes should be forbidden in America．

　　D．Most of the Americans don’t like e-cigarettes．

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