题目内容：

Why do people smoke? One reason is that people become addicted(上瘾) to cigarettes. The addictive thing in cigarettes is nicotine. When people smoke, the nicotine goes right into the blood stream and makes people feel comfortable. A smoker's body gets used to the nicotine, and if he stops smoking, he feels nervous. Many smokers try to stop smoking but because of the addiction to nicotine they feel so uncomfortable that they often find it too difficult to do so .

Another reason is that people just enjoy smoking. Having a cigarette for many people means taking a break. For some people smoking becomes part of certain social manners, for example, sending the cigarette after dinner. Many people enjoy smoking because it gives them something to do with their hands. Reaching for a cigarette, lighting it and flicking the cigarette ashes are special comfort in a situation where they feel nervous.

Many people also like the taste of tar (焦油) in cigarettes. However, it is the tar that causes cancer. While governments and health experts have tried to  get people to stop smoking completely, cigarette producers have tried to keep selling them by producing cigarettes with less tar. Many people in western countries have welcomed these cigarettes since they found it hard to stop smoking and wanted to reduce the danger to their health.

1.According to the passage, what gets people into the habit of smoking?

A. Ashes    B. Nicotine    C. Smoke    D. Tar

2.Health experts are trying to advise people to ______.

A. smoke less a day    B. buy cigarettes with less tar

C. smoke only after dinner    D. give up smoking

3.Which of the following words has the similar meaning to the underlined word?

A. 扑灭.    B. 弹掉    C. 进入    D. 驱除

4.Which of the following sentences is TRUE, according to the passage?

A. Smokers continue smoking because smoking is very interesting.

B. Tar in cigarettes causes cancer.

C. In order to look cool, many people enjoy smoking.

D. Many people in western countries welcome the cigarettes with more tar.