【正确答案】
A
【答案解析】[听力原文] Good morning. Today I'd like to talk about electronic cigarettes. Electronic cigarettes are battery-operated devices designed to deliver nicotine with flavorings and other chemicals to users in vapor instead of smoke. They can be manufactured to resemble traditional tobacco cigarettes, cigars or pipes, or even everyday items like pens or USB memory sticks; newer devices, such as those with tillable tanks, may look different. More than 250 different e-cigarette brands are currently on the market. While e-cigarettes are often promoted as safer alternatives to traditional cigarettes, which deliver nicotine by burning tobacco, little is actually known yet about the health risks of using these devices. Cigarette smoking remains the leading preventable cause of sickness and mortality, responsible for over 400, 000 deaths in the United States each year. E-cigarettes are designed to simulate the act of tobacco smoking by producing something that looks and feels like tobacco smoke and delivers nicotine but with less of the toxic chemicals produced by burning tobacco leaves. Because they deliver nicotine without burning tobacco, e-cigarettes appear as if they may be a safer, less toxic alternative to conventional cigarettes. Although they do not produce tobacco smoke, e-cigarettes still contain nicotine and other potentially harmful chemicals. Nicotine is a highly addictive drug, and recent research suggests nicotine exposure may also prime the brain to become addicted to other substances. Also, testing of some e-cigarette products found the vapor to contain toxic chemicals. The health consequences of repeated exposure to these chemicals are not yet clear. Some people believe e-cigarette products may help smokers lower nicotine addiction while they are trying to discontinue their tobacco use. However, at this point it is unclear whether e-cigarettes may be effective as smoking-cessation aids. There is also the possibility that they could perpetuate the nicotine addiction and thus interfere with quitting. Because e-cigarettes are not currently marketed either as tobacco products or as devices having a therapeutic purpose, they are not regulated by the FDA. In addition, there is currently no regulation of the liquids that are used in e-cigarettes. So, there are no accepted measures to confirm their purity or safety. What do we learn about e-cigarettes? 录音提到电子香烟是用电池做电源的，故选A项。录音提到电子香烟以水蒸气而非烟雾的形式给人们传递了尼古丁及其他化学物质，故B项“电子香烟不会传递尼古丁”不正确。在外形上电子香烟可以做成传统的香烟、雪茄或者烟管的形状，也可以做成日常生活用品的造型，因此C项“电子香烟看起来不像传统香烟”过于绝对。目前市场上已有250多种不同品牌的电子香烟，故D项“电子香烟即将上市”不正确。