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Passage8
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 _1_ and mostly unstudied. With cute colors, fruity flavors clever designs and other options, e-cigarettes may hold too much _2_ for young people, critics warn, offering an easy gateway to nicotine addiction. But those criticisms clash with _3_ strong arguments for the value of e-cigarettes. The devices, which are tobacco-free, may be a safer _4_ to cigarettes, say advocates, who point to thousands of smoker who say they have used e-cigarettes to help them quit
Electronic cigarettes _5_ 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 cigarettes are made to look like real cigarettes, cigars or pipes. Others look like pens or USB memory devices. No tobacco is _6_ 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 _7_ cigarettes. Tobacco contains about 5,000 _8_ chemicals with as many as 100,000 more that haven’t yet been known. E-cigarettes _9_ 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 _10_.
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

解题思路

Passage 8
解题思路
1.[L]空格作remained的表语，可能是名词、形容词或分词。空格所在定语从句解释纽约禁止电子香烟的原因。unregulated符合句法和语义要求，remained unregulated意为“（电子香烟)仍缺乏监管”。
2.[H] too much提示空格处应为不可数名词。句子开头提到“颜色可爱、水果味、设计巧妙”，这表明电子香烟对年轻人“很有吸引力”，appeal符合句意。
3.[J]此处需填人修饰strong的副词。空格前后的criticisms和value形成对比，再结合下文提到电子香烟的好处，可知有些人批评，有些人赞成，equally符合上下文语境，指争论双方“旗鼓相当”。
4.[A] 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。
5.[F]句子主谓宾语齐全，空格处应填人副词。本段从工作原理、外观等方面介绍电子香烟。副词库中typically符合语义，表明电子香烟“通常”使用一个可充电电池驱动的加热器对可替换烟管里的尼古丁进行加热雾化。
6.[E]空格作句子表语,再结合其后的介词in,推断空格可能是分词。上文提到，电子香烟利用加热器对烟管里的尼古丁进行加热并使其雾化，由此可知这种香烟不需要用到烟草。involved“含有”符合上下文语义。
7.[C]空格所在句意为“通过将尼古丁分离出来，与……香烟相比，电子香烟导致的化学危害要小得多”，regular符合语境，regular cigarettes意为“普通香烟”。
8.[O]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。
9.[M]空格处填人动词原形作句子谓语。本段首句提到，电子香烟带来的化学危害比普通香烟少得多，再结合上一句对烟草化学成分的描述，可以推断电子香烟危害低是因为“去掉”了烟草中的许多化学成分,eliminate符合上下文语义。
10.[K]不定式标记to提示空格为动词原形。此句总结电子香烟并不完美，但至少比普通香烟好。句中they指“电子香烟”，句中比较关系表明what应指“普通香烟”replace符合句意，指出电子香烟比它所要取代的香烟好。