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  3. Electronic cigarettes are handheld nicotine-delivery devices that, despite a devoted following, are currently swirling in contro

Electronic cigarettes are handheld nicotine-delivery devices that, despite a devoted following, are currently swirling in contro

admin2018-05-11  4
问题     Electronic cigarettes are handheld nicotine-delivery devices that, despite a devoted following, are currently swirling in controversy. New York is pushing to become the first state to ban the devices, which so far remain【C1】______ and mostly unstudied. With cute colors, fruity flavors, clever designs and other options, e-cigarettes may hold too much【C2】______ for young people, critics warn, offering an easy gateway to nicotine addiction. But those criticisms clash with【C3】______ strong arguments for the value of e-cigarettes. The devices, which are tobacco-free, may be a safer【C4】______ to cigarettes, say advocates, who point to thousands of smokers who say they have used e-cigarettes to help them quit.
    Electronic cigarettes【C5】______ use a rechargeable battery-operated heating element to vaporize the nicotine in a replaceable pipe. Nicotine is the substance in tobacco that people can become addicted to. Some e-cigarettes are made to look like real cigarettes, cigars or pipes. Others look like pens or USB memory devices. No tobacco is【C6】______ in e-cigarettes and there is no smoke either. Instead, as users breathe in, they take in nicotine-filled vapor.
    By isolating nicotine, e-cigarettes should carry far fewer chemical risks than【C7】______ cigarettes. Tobacco contains about 5,000【C8】______ chemicals with as many as 100,000 more that haven’t yet been known. E-cigarettes【C9】______ many of those ingredients. Researchers also found evidence that e-cigarettes reduce desires among smokers, not just for nicotine but also for the need to hold something in their hands and put something in their mouths. As a cigarette-quitting strategy, it’s not that the devices are good for anyone, but they are just better than what they’re meant to【C10】______
A) alternative B) engaged C) regular D) opaque
E) involved F) typically G) solely H) appeal
I) momentum J) equally K) replace L) unregulated
M) eliminate N) detect O) identified
【C4】
选项
答案A
解析 a提示空格处应为单数名词。句子后半部分提到，很多人借助电子香烟戒烟，可见它可以“替代”普通香烟。名词库中alternative“供替代的选择”能与to搭配，符合句意。
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