Passage 3 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 第1空答案是：