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1. 阅读理解
Scientific experiments
can sometimes go wrong and when they do, the results may range from the disastrous
(灾难性的) 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
easy-going 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, which 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. They 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 (刺), began to attack their neighbours—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 bad enough if the bees had stayed in Brazil. But now they are on the move,
heading northwards in countless millions towards Central and North 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.
（1）The results of the South American experiment .
A . are not important
B . are not yet certain
C . have caused a serious trouble
D . have proved to be wrong
（2）The experiment mentioned in this passage was designed to .
A . make African bees less active
B . increase the number of bees in Brazil
C . make Brazilian bees more easy-going
D . increase the amount of honey in Brazil
（3）Which of the following may be the cause of the new bees' attacking personalities?
A . Their bad temper.
B . Their hard work.
C . Their production of honey.
D . Their living environment.
（4）The last paragraph implies that .
A . the bees prefer to live in Brazil
B . the bees must be stopped from moving north
C . the bees may bring about trouble in more countries
D . the bees have been driven to Central and North America
