题目内容
（请给出正确答案）
Another reason why small countries are less involved in high-tech markets is that ______.
A．laziness
B．less creativity
C．the transportation costs of low-tech products
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听力原文： Why don't birds get lost on their long flights from one place to another？ Scientists have puzzled over this question for many years. Now they are beginning to fill in the blanks.
Not long ago, experiments showed that birds rely on the sun to guide them during daylight hours. But what about birds that fly by night？ Tests with artificial stars have proved that certain night-flying birds are able to follow the stars in their long-distance flights.
A dove had spent his lifetime in a cage and had never flown under a natural sky. Yet it showed an inborn ability to use the stars for guidance. The bird's cage was placed under an artificial star-filled sky. The bird tried to fly in the same direction as that taken by his outdoor cousins. Any change in the position of the artificial stars caused a change in the direction of his flight.
But the stars are apparently their principal means of navigation. When the stars are hidden by clouds, they apparently find their way by such landmarks as mountain ranges, coast lines, and river courses. But when it's too dark to see these, the doves circle helplessly, unable to find their way.
The reason why birds don't get lost on long flights ______.
A．has been known to scientists for years
B．has only recently been discovered
C．is known by everyone
D．will probably remain a mystery
听力原文： Cambridge must be one of the best-known towns in the world, and can be found on most tourists' lists of places to visit. The main reason for its fame is its universities which started during the 13th century and grew steadily. Until today there are more than twenty colleges.
The oldest college is Peterhouse, which was founded in 1284, and the most recent is Robinson College, which was opened in 1977. The most famous is probably King's College, because of its magnificent church.
The university was exclusively for men until 1871 when the first women's college was opened. Another was opened two years later and a third in 1954. In the 1960s, most colleges opened their doors to both men and women. Almost all the colleges are now mixed, but it will be many years before there are equal numbers of both sexes.
What is the main reason why Cambridge is one of the best-known towns in the world？
A．Because it is a favorite place for tourists.
B．Because it has a famous university.
C．Because the town was started in the 13th century.
D．Because the university has twenty well-known colleges.
听力原文： Why do people smoke？
One reason is that people become addicted to cigarettes. The addictive substance in cigarettes is nicotine. When people smoke, the nicotine goes right 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 the addiction to nicotine they feel so uncomfortable that they often find it too difficult to stop.
Another reason is that people simply enjoy smoking. Having a cigarette for many people means taking a break. For some people smoking becomes part of their daily life. Many people enjoy smoking because it gives them something to do with their hands.
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 get people to give up smoking entirely, cigarette manufacturers 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 stop smoking but they want to reduce the risk to their health.
(30)
A．Because they like the taste of tar.
B．Because smoking makes them feel relaxed.
C．Because smoking to them means fan.
D．Because smoking is the easiest thing to get addicted to.
According to this passage, the reason why we go wrong about our friends is that______.
A．even friends are annoyed when we check what they say
B．people usually state one thing and mean another
C．we fail to listen carefully when others talk
D．we tend to doubt what our friends say
According to the author, the reason why we go wrong about our friends is that ______.
A)we fall to listen carefully when they talk
B)people tend to be annoyed when we cheek what they say
C) people usually state one thing hut means another
D)we tend to doubt what our friends say
Not long age, experiments showed that birds rely on the sun to guide them during daylight hours. But what about birds that fly by night？ Tests with artificial stars have proved that certain night - flying birds are able to follow the stars in their long - distance flights.
A dove (鸽子) had spent its lifetime in a cage and had never flown under a natural sky. Yet it showed an inborn ability to use the stars for guidance. The bird's cage was placed under an artificial star - filled sky. (76) The bird tried to fly in the same direction as that taken by his outdoor cousins. Any change in the position of the artificial stars caused a change in the direction of his flight.
(77) But the stars are apparently their principal means of navigation (航行) only. When the stars are hidden by clouds, they seemingly find their way by such landmarks as mountain ranges, coast lines, and river courses. But when it's too dark to see these, the doves circle helplessly, unable to find their way.
The reason why birds don't get lost on long flights ______.
A．have been known to scientists for many years
B．have only recently been discovered
C．are known by us
D．will probably remain a mystery
According to the author, the reason why we go wrong about our friends is that______.
A．we fail to listen carefully when they talk
B．people tend to be annoyed when we check what they say
C．people usually state one thing but means another
D．we tend to doubt what our friends say
听力原文： Why de people smoke？ One reason is that people become 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 manufacturers have to keep selling them by producing cigarettes with less tar. Many people in western countries have welcomed these cigarettes since they find it difficult to stop smoking but want to reduce its risk.
Why are so many people dependent on cigarette？
A．Because they like the taste of tar.
B．Because smoking makes them feel relaxed.
C．Because smoking is funny.
D．Because smoking cures disease.
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