[单项选择]

Why do people smoke One reason is that people be come dependent on cigarettes. The substance which people cannot resist in cigarettes is nicotine. When people smoke the nicotine goes directly into the blood stream and makes people feel relaxed. A smoker’s body gets accustomed to the nicotine and if he stops smoking he feels nervous. Many smokers try to stop smoking but because of their dependence on nicotine they feel so uncomfortable that they often find it too hard to stop.
Another reason is that people simply enjoy smoking and what it symbolizes. Having a cigarette for many people means taking a break. For some people smoking becomes part of certain social forms, for example, the cigarette after dinner. Many people enjoy smoking because it makes their hands busy.
Many people also like the taste of tar in cigarettes. However, it is the tar that causes cancer. While governments and health experts have tried to make people give up smoking entirely, cigarette
A. To buy cigarettes with less tar.
B. To smoke only a few cigaretes a day.
C. To smoke only during a break.
D. To give up smoking entirely.

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[单项选择]

Why do people smoke One reason is that people be come dependent on cigarettes. The substance which people cannot resist in cigarettes is nicotine. When people smoke the nicotine goes directly into the blood stream and makes people feel relaxed. A smoker’s body gets accustomed to the nicotine and if he stops smoking he feels nervous. Many smokers try to stop smoking but because of their dependence on nicotine they feel so uncomfortable that they often find it too hard to stop.
Another reason is that people simply enjoy smoking and what it symbolizes. Having a cigarette for many people means taking a break. For some people smoking becomes part of certain social forms, for example, the cigarette after dinner. Many people enjoy smoking because it makes their hands busy.
Many people also like the taste of tar in cigarettes. However, it is the tar that causes cancer. While governments and health experts have tried to make people give up smoking entirely, cigarette
A. Because they like the taste of tar.
B. Because smoking makes them feel relaxed.
C. Because smoking is fun to them.
D. Because smoking cures them of cancer.

[填空题]The reason why people in the past believed that the ordinary Mayan people lived in the countryside was that their knowledge was based on uncovered large buildings.

[填空题]The reason why people announce that "things are not what they were in my young days" is that their ______ is not the same as before.