閲讀理解讀下列短文，從每小題後所給的A、B、C、D四個選項中，選出最佳選項。Whydopeoplesmoke?...

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閲讀理解

讀下列短文，從每小題後所給的A、B、C、D四個選項中，選出最佳選項。

Why do people smoke? One reason is that people become addicted to (對……有癮) cigarettes. The addictive substance in cigarettes is nicotine. When people smoke, the nicotine goes right into the blood stream and makes people relaxed. A smoker's body becomes used to the nicotine and if he stops smoking he feels nervous. Many smokers try to give up smoking, but because of the addiction to nicotine they feel so uncomfortable that they often find it too hard to do so. Another reason is that people only enjoy smoking. Having a cigarette for many people means taking a break. For some people smoking becomes part of certain social rituals (禮節), for example, the cigarette after dinner. Lots of people enjoy smoking because it provides something to do with their hands. Reaching for a cigarette, lighting it, and flicking the ashes is especially comfortable in situations where a person feels 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 give up smoking completely, cigarette manufacturers (製造商) have tried to keep selling them by producing cigarettes with less tar. Many people in western countries have welcomed these cigarettes since they find it hard to give up smoking, but want to reduce the danger to their health.

1．Lots of people become addicted to cigarettes because ________.

A. smoking does good to their health

B. the nicotine goes right into the blood stream and makes people feel relaxed

C. they like to see smoke come out of their mouths and noses

D. they need to get some tar from cigarettes

2．What substance in cigarettes causes cancer?

A. Nicotine.

B. Tar.

C. The passage doesn't tell us.

D. Blood stream.

3．The underlined word “flicking” in the first paragraph means ________.

A. 輕吹 B. 吐出