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  3. Electronic cigarettes are handheld nicotine-delivery devices that, despite a

Electronic cigarettes are handheld nicotine-delivery devices that, despite a

游客2024-04-04  43
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 [br] 【C8】
选项
答案 O
解析 空格在名词前面，可能是名词、形容词或分词作定语。空格后提到“仍有10万种以上‘未知的’化学成分”，由此推断空格所在部分讲烟草中已有5000种“已知的”化学成分。identified作定语表示“已鉴定的、已认出的”，符合句意。
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