|
阅读下面这篇短文，短文后有2项测试任务： 第23～26题要求从所给的6个选项中为第2～5段每段选择1个正确的小标题;第27～30题要求从所给的6个选项中选择4个正确选项，分别完成每个句子。请将答案涂在答题卡相应的位置上。 Quit Smoking 1 Anyone who has ever tried to give up smoking cigarettes knows the meaning of being hooked. Even those who succeed in quitting for the first time suffer the same 75% relapse rate as recovering alcoholics and heroin addicts. Last week, the U. S. Surgeon General made official what everyone has recognized for a long time-tobacco, like cocaine or heroin, is addictive. 2 The panic of a heave smoker bereft of cigarettes speaks alarmingly of a physiological force at work that is more powerful than mere desire. Not long after taking up the habit, smokers become tolerant of nicotines effects as with heroin and cocaine, dependence quickly follows. 3 Like many drugs that affect the nervous system, nicotine at once stimulates and relaxes the body. Because it is inhaled, it takes only seven to ten seconds to reach the braintwice as fast as intravenous drugs and three times faster than alcohol. Once there, it mimics some of the actions of adrenaline, a hormone, and acetylcholine, a powerful neurotransmitter that touches off the brains alarm system, among other things. After a few puffs, the level of nicotine in the blood skyrockets, the heart beats faster and blood pressure increases. The result is that smokers become more alert and may actually even think faster. | 
