to use three times less fuel than current cars

Which of the following is NOT included in the scientists' suggestions？

A．Farmers should use less insecticides.

B．Farmers should use a combination of two or three insecticides at once.

C．At certain times of the year, farmers should actually try to attract new insects onto the crops they are trying to protect.

D．Farmers should regularly spray crops as a precaution against problems that are caused by large numbers of pests.

听力原文：W: I'm glad I don't have your job,working all night and sleeping in the daytime.

M: Oh,I stopped that when l got my promotion.Now I'm on four days and off three days.

Q: How does the man work now？

(19)

A．He works three nights every two weeks.

B．He works four times as much as he did before.

C．He has twice as much work as he used to have.

D．He has three free days for every four days he works.

ls for defense against insects. But insects have developed ways of dealing with them and, in fact, have been eating plants for about 250 million years. Now insects are using these same mechanisms to deal with man - made poisons—insecticides. This is why resistance of insects to insecticides has developed so rapidly. What should be done？ Scientists studying the problem suggest that farmers use less insecticides. At the moment, farmers regularly spray crops as a precaution against problems that are caused by large numbers of pests. They should, instead, spray only where pests have actually been seen. Secondly, farmers could use a combination of two or three insecticides at once. To survive, the insects would need to become resistant to two or more insecticides at the same time. The most surprising suggestion, perhaps, is that at certain times of the year, farmers should actually try to attract insects onto the crops they are trying to protect. The new insects will mate with those which survived from a certain kind of insecticide and will lessen the latter' s resistance to it. Scientists hope that these and other measures will postpone the saying when farmers and scientists will have to stand by while new super - bugs which may be resistant to all poisons invade our farms and devour our crops.

What conclusion can be drawn from the scientists' observation？

A．Insects have developed some sort of resistance to man - made poisons.

B．Insects have been eating plants for about 250 million years.

C．Farmers sometimes use a combination of two or three insecticides at once.

D．New insects mate with insects which survived from a certain kind of insecticide.

Have you ever noticed advertisements which say "Learn a foreign language in six weeks, or your money back! From the first day your pronunciation will be excellent. Just send. . . " and so on？ Of course, it never happens quite like that. The only language that is easy to learn is the mother tongue. Think how much practice that gets!Before the Second World War people usually learnt a foreign language in order to read the literature of the country. Now speaking the foreign language is what most people want. Every year many millions of people start learning one.

Some people try at home, with books and records or tapes; some use radio or television programmes; others go to evening classes. If they use the language only twice or three times a week, learning it will take a long time. A few people try to learn a language fast by studying for six or more hours a day. It is clearly easier to learn the language in the country where it is spoken. However, most people cannot afford this, and for many it is not necessary. They need the language in order to do their work better. For example, scientists and doctors chiefly need to be able to read books and reports in the foreign language. Whether the language is learnt quickly or slowly, it is hard work. Machines and good books will help, but they cannot do the student's work for him.

31. The advertisements say it would be easy to_________.

A. speak your native language better

B. keep in mind any foreign language

C. learn a foreign language within several weeks

D. learn by heart a foreign language

32. Nowadays most people want to learn_________.

A. about the country where a language is spoken

B. to speak a foreign language

C. to read essays in the foreign language

D. to write in the foreign language

33. Before the 2nd World War people usually learnt a foreign language in order to_________.

A. communicate with their foreign friends

B. read the foreign newspaper

C. read the literacy works of the country

D. talk with their foreign friends

34. If you only use the language twice or three times a week ,_________.

A. it is impossible to learn it well

B. it will take a long time to learn the foreign language

C. you will never learn the language well

D. perhaps you will learn harsh language

35._________is very important whether a foreign language is learnt quickly or slowly.

A. Talent

B. Intelligence

C. Ability

D. Hard work

请根据短文内容，回答题。

Cigars Instead？

Smoking one or two cigars a day doubles the risk of cancers of the lip, tongue, mouth, and throat, according to a government study.

Daily cigars also increase the risk of lung cancer and cancer of the esophagus, and increase the risk of cancer of the larynx (voice-box) six-fold, say researchers at the National Cancer Institute in Bethesda, Maryland.

In addition, the report revealed that smoking three or four cigars a day increased the risk of oral cancer to 8.5 times the risk for nonsmokers and the risk of esophageal cancer by four times the risk of nonsmokers.

The health effects of smoking cigars is one of eight sections of the article "Cigars: Health Effects and Trends." The researchers report that, compared with a cigarette, a large cigar emits up to 90 times as much carcinogenic tobacco-specific nitrosamines.

"This article provides clear and invaluable information about the disturbing increase in cigar use and the significant public health consequences for the country," said Dr. Richard Klausner,director of the National Cancer Institute, in a statement.

"The data are clear -- the harmful substances and carcinogens in cigar smoke, like cigarettes, are associated with the increased risks of several kinds of cancers as well as heart and lung diseases," he added. "In other words, cigars are not safe alternatives to cigarettes and may be addictive."

"To those individuals who may be thinking about smoking cigars, our advice is -- don&39;t. To those currently smoking cigars, quitting is the only way to eliminate completely the cancer, heart and lung disease risks," warned Klausner.

According to National Cancer Institute press release, there haven&39;t been any studies on the health effects on nonsmokers at cigar social events, but "...a significant body of evidence clearly demonstrates and increased lung cancer risk from secondhand smoke."

According to the report， smoking three or four cigars a day __________. 查看材料

A.increases the risk of oral cancer for non-smokers

B.greatly increases the risk of oral cancer for smokers

C.increases the risk of more than one cancer for non-smokers

D.greatly increases the risk of more than one cancer for smokers

阅读材料，回答题：

Cigars Instead？

Smoking one or two cigars a day doubles the risk of cancers of the lip, tongue, mouth, and

throat, according to a government study.

Daily cigars also increase the risk of lung cancer and cancer of the esophagus, and increase the risk of cancer of the larynx (voice box) sixfold, say researchers at the National Cancer Institu- te in Bethesda, Maryland.

In addition, the report revealed that smoking three or four cigars a day increased the risk of oral cancer to 8.5 times the risk for nonsmokers and the risk of esophageal cancer by four times the risk of nonsmokers.

The health effects of smoking cigars is one of eight sections of the article "Cigars: Health Effects and Trends". The researchers report that, compared with a cigarette, a large cigar emits up to 90 times as much carcinogenic tobacco-specific nitrosamines.

"This article provides clear and invaluable information about the disturbing increase in cigar use and the significant public health consequences for the country," said Dr. Richard Klausner, director of the National Cancer Institute, in a statement.

"The data are clear--the harmful substances and carcinogens in cigar smoke, like ciga- rettes, are associated with the increased risks of several kinds of cancers as well as heart and lung diseases," he added. " In other words, cigars are not safe alternatives to cigarettes and may be addictive. "

"To those individuals who may be thinking about smoking cigars, our advice is don&39;t. To those currently smoking cigars, quitting is the only way to eliminate completely the cancer, heart and lung disease risks," warned Klausner.

According to a National Cancer Institute press release, there haven&39;t been any studies on the health effects on nonsmokers at cigar social events, but "... a significant body of evidence clearly demonstrates an increased lung cancer risk from secondhand smoke. "

According to the report， smoking three or four cigars a day 查看材料

A.increases the risk of oral cancer for non-smokers

B. greatly increases the risk of oral cancer for smokers

C.increases the risk of more than one cancer for non-smokers

D.greatly increases the risk of more than one cancer for smokers

请根据短文的内容，回答题。

Cigars Instead？

Smoking one or two cigars a day doubles the risk of cancers of the lip, tongue, mouth, and throat,according to a government study"＜br＞

Daily cigars also increase the risk of lung cancer and cancer of the esophagus, and increase the risk of cancer of the larynx (voice-box) six-fold, say researchers at the National Cancer Institute in Bethesda, Maryland.＜br＞

In addition, the report revealed that smoking three or four cigars a day increased the risk of oral cancer to 8.5 times the risk for nonsmokers and the risk of esophageal cancer by four times the risk of nonsmokers.＜br＞

The health effects of smoking cigars is one of eight sections of the article Cigars: Health Effects and Trends. The researchers report that, compared with a cigarette, a large cigar emits up to 90 times as much carcinogenic tobacco-specific nitrosamines.＜br＞

"This article provides clear and invaluable information about the disturbing increase in cigar use and the significant public health consequences for the country," said Dr. Richard Klausner,director of the National Cancer Institute, in a statement.＜br＞

"The data are clear -- the harmful substances and carcinogens in cigar smoke, like cigarettes,are associated with the increased risks of several kinds of cancers as well as heart and lung diseases," he added. "In other words, cigars are not safe alternatives to cigarettes and may be addictive."＜br＞

"To those individuals who may be thinking about smoking cigars, our advice is -- don&39;t. To those currently smoking cigars, quitting is the only way to eliminate completely the cancer, heart and lung disease risks," warned Klausner.＜br＞

According to National Cancer Institute press release, there haven&39;t been any studies on the health effects on nonsmokers at cigar social events, but "...a significant body of evidence clearly demonstrates an increased lung cancer risk from secondhand smoke.

According to the report， smoking three or four cigars a day __________. 查看材料

A.increases the risk of oral cancer for non-smokers

B.greatly increases the risk of oral cancer for smokers

C.increases the risk of more than one cancer for non-smokers

D.greatly increases the risk of more than one cancer for smokers

ions？

Woman: Yes, of course, go ahead.

Interviewer: Right. Do you travel for business？

Woman: Yes, I do. On average, I'd say I spend two or three days a week visiting customers.

Interviewer: Right ... "regularly". Now, do you ever work at home？

Woman: No, I don't. I'm seldom at home. I don't want to work there, too.

Interviewer: OK. Next question. Do you ever make presentations？

Woman: Yes, I do.

Interviewer: How often do you do that？

Woman: Let me see. Two or three times a month maybe. Some months it's more, some months it's less.

Interviewer: Right. Let's say ... "often". Now, do you usually do your own typing？

Woman: I'm afraid so. I don't have anyone to do it for me.

Interviewer: OK. Do you use a computer at work？

Woman: Sure. I'd be lost without it!

Interviewer: OK, I'll mark that "regularly". Do you ever buy computer magazines？

Woman: No, I don't. Never.

Interviewer: Right. And one last question ... Could you just look at this and tell me which age bracket you're in ...

(20)

A．Marketing.

B．Traveling.

C．Computers.

D．Customers.

听力原文： Scientists have discovered that plants themselves produce many poisonous chemicals for defense against insects. But insects have developed ways of dealing with them and, in fact, have been eating plants for about 250 million years. Now insects are using these same mechanisms to deal with man-made poisons—insecticides. This is why resistance of insects to insecticides has developed so rapidly.

What should be done？ Scientists studying the problem suggest that farmers use less insecticides. At the moment, farmers regularly spray crops as a precaution against problems that are caused by large numbers of pests. They should, instead, spray only where pests have actually been seen. Secondly, farmers could use a combination of two or three insecticides at once. To survive, the insects would need to become resistant to two or more insecticides at the same time.

The most surprising suggestion, perhaps, is that at certain times of the year, farmers should actually try to attract insects onto the crops they are trying to protect. The new insects will mate with those which survived from a certain kind of insecticide and will lessen the latter's resistance to it.

Scientist hope that these and other measures will postpone the day when farmers and scientists will have to stand by while new super-bugs which may be resistant to all poisons invade our farms and devour our crops.

What have scientists discovered about plants and insects？

A．Plants produce many poisonous chemicals for defense against insects.

B．Insects develop ways of dealing with natural poisonous chemicals but not man-made ones.

C．Farmers must spray plants all the time.

D．Farmers must use different brands of insecticides.

听力原文： In the past two years, millions of Americans have suddenly embraced the bicycle as if it were a startling new invention. Annual bike sales doubled between 1960 and 1970, and there are nearly 70 million bikes in the United States today. That's more than two for every three automobiles.

Of course, the bike has been around for more than 150 years, and this isn't America's first bicycle boom. A wave of bike enthusiasm swept the land in the late 1800s and bicycle production hit two million units in 1897. Then with the coming of the auto, bicycling declined, and for decades remained popular only with children and a few adult faddists.

Now, national preoccupation with air pollution and physical fitness has brought the bike back to the forefront—particularly with adults. More than eight million bikes were sold in the United States last year and a third of them went to adults. The year before, only 15 percent of new bike sales were for adults.

(30)

A．The use of bikes is a new invention in the U.S.

B．Annual bike sales doubled in the 60s in the U.S.

C．The producers made 70 million bikes every year.

D．The number of bikes is two times that of cars in the U.S.