Scientific experiments can sometimes go wrong and when they do the results may range from the disastrous to the troubling. One such experiment took place in South America about fifty years ago. Whether its final consequences will cause serious damage or nothing more than a small trouble still remains to be seen.

The story began in 1956 when an American scientist working in Brazil decided to solve the problem of increasing the productivity of that country’s bees. He imported a very active type of African bee from Tanzania and mated(交配) it with the more easygoing native variety to produce a new kind of bees. The new bees worked harder and produced twice as much honey. It seemed that Professor Kerr, for that was the scientist’s name, had a total success on his hands.

Then things began to go wrong. For some reason as yet unseen, but perhaps as a result of something in their environment, the new bees began to develop extremely attacking personalities. They became bad-tempered and easy to be angry, attacked the native bees and drove them from their living places.

But worse was to follow. Having taken over the countryside, the new bees. With their dangerous stings(叮), began to attack its neighbors —cats,dogs,horses, chickens and finally man himself. A long period of terror began that has so far killed a great number of animals and about 150 human beings.

This would have been enough if the bees had stayed in Brazil. But now they are on the move, heading northwards in countless millions towards Central and Notth America, and moving at the alarming speed of 200 miles a year. The countries that lie in their path are naturally worried because it looks as if nothing can be done to stop them.

56.The results of the South American experiment ____________

A. have caused a serious trouble       B. have proved to be wrong

C. are not yet certain                D. are not important

57.The experiment mentioned in this passage was designed to _________

A. increase the amount of honey in Brazil   B. make Brazilian bees more easy-going

C. increase the number of bees in Brazil     D. make African bees less active

58.Which of the following may be the cause of the new bees’ attacking personalities?

A. Their production of honey      B. Their hard work

C. Their living environment       D. Their bad temper

59.The last paragraph implies that_____

A. the bees have been driven to Central and North America

B. the bees may bring about trouble in more countries

C. the bees must be stopped from moving north

D. the bees prefer to live in Brazil.

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A father in Wuhan, nicknamed "Eagle Dad" for his controversial parenting style, has dismissed critics' claims that he pushes his 4-year-old son too hard.

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A. He employed some college students to teach his son.

B. He made his kid take a long distance race.

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C. Laughing at.  D. Talking about.

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A. he didn’t take it step by step in a scientific way

B. the highly tense work-out was misunderstood

C. modern education is not challenging enough

D. some parents were jealous of his success

 

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It is often said that man has become the enemy of our planet. This is no exaggeration(夸張), for reports show that man’s greed has done much to destroy the earth. Man, in his greedy desire for financial growth, has polluted the air, land and water, and has robbed our valuable natural resources. Man’s industrial plants pour out poisonous waste that pollutes the sea and puts life in the sea under the threat of dying out; at the same time, they release alarming amounts of carbon dioxide, chlorofluorocarbons (CFCs) and other pollutants. Small wonder that the air now is much warmer and more impure than ever before.

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C. To export trees to other countries.

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B. They just don’t know how to solve the problem.

C. They haven’t realized the seriousness of the problem.

D. They don’t want to break their international commitment.

4.What is the author’s attitude towards the future of the environment?

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