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(C)
In recent years, especially during the l960s, there was much discussion about “the brain drain (排干, 流失),” which dealt with the problem of students and learned people who left their own countries for other countries that offered better chances for study, research, and employment．For example, according to a report from U．N., between 1962 and l966 more than 50 percent of all engineering graduates of Iran and 14 percent of Iranian scientists left their country for work abroad．Over 30 percent of Chilean engineers and 15 percent of Turkish physicians also went to work in other countries．Probably the greatest brain drain occurred among young scientists who had gone abroad to study．Many of them had planned to return to their countries to teach but chose to remain in more industrialized nations where they were able to continue their work and their research in fields in which there were no job possibilities at home．The countries that attracted most of these scientists were the United States, Great Britain, Germany, France, Canada, and Australia.
Recent studies show that the brain drain to the United States may be decreasing．Many foreign scientists are going home again, and in some cases American scientists are leaving the United States for employment in other countries．The main reasons are that good jobs are becoming fewer here, money for national research has been sharply cut, and university fellowships reduced too．However, in the field of medicine the drain to the United States still goes on．Today more than one of every five American doctors is foreign - born, and several thousand foreign doctors immigrate to the United States each year．Over eighty countries have asked the State Department to send students who are skilled in important fields such as medicine back home when their study programs are over.
64．Which of the following is not the reason for “the brain drain”?
A．Better chances of study.
B．Better research condition.
C．Good job possibility.
D．Good housing.
65．The brain drain to the United States may be decreasing mainly because __________.
A．many foreign scientists are ordered to return to their motherlands
B．there are fewer and fewer good jobs in the USA
C．they don't need any foreign scientists now
D．the universities refuse to provide money for the foreign scientists
66．How many American doctors are foreign - born?
A．More than 20 percent.
B．About half of them.
C．Several thousand.
D．About 15 percent.
67．Which is the best title for this passage?
A．How to seek a job in the USA.
B．Doctors' immigration to the USA.
C．The brain drain.
D．A strange case.
(D)
Listening to music while you drive can improve your speed and ability to get away from accidents, according to Australian psychologists (心理学家)．But turning your car radio up to full volume could probably make you end up in an accident．The performance of difficult tasks can be affected if people are subjected to loud noise．The experience of pulling up at traffic lights alongside care with loud music made some psychologists in the University of Sydney look into whether loud music has something to do with driving.
The psychologists invited 60 men and women aged between 20 and 28 as subjects and tested them on almost the same driving tasks under three noise conditions：silence, rock music played at a gentle 55 decibels (分贝), and the same music at 85 decibels.
For l0 minutes the subjects sat in front of a screen operating a simple machine like a car．They had to track a moving disk on screen, respond to traffic signals changing color, and brake (刹车) in response to arrows that appeared without warning.
On the tracking task, there was no difference in performance under the three noise conditions．But under both the loud and quiet music conditions, the performers “braked” at a red light about 50 milliseconds sooner than they did when there was no rock music at all．That could mean a reduction in braking distance of a couple of meters actually, the difference between life and death for a pedestrian(行人).
When it came to the arrows that appeared across the visual field, the psychologists found that when the music was quiet, people responded faster to objects in their central field of sight by about 50 milliseconds．For the people listening at 85 decibels, response times dropped by a further 50 milliseconds - a whole tenth of second faster than those “driving” with no music.
“But there’s a trade - off,” the psychologists told the European Congress of Psychology．“They lose the ability to look around the whole situation effectively.” In responding to objects that suddenly appeared, people subjected to 85-decibel rock music were around 100 milliseconds slower than both the other groups．Since some accidents - such as children running into the road -take place without any notice, drivers listening to loud music must be less safe as a result.
68．Which of the following is the best way to make driving safer?
A．Loud music.
B．Quiet music.
C．Silence.
D．Heavy metal music.
69．What does the phrase “pulling up” in paragraph two mean?
A．Stopping.
B．Giving somebody a lift.
C．Putting up with.
D．Driving.
70．Where did the researchers do the experiment?
A．At crossroads.
B．At a police traffic station.
C．In a crowded street.
D．Under the same conditions as those of the streets.
71．Which of the following didn't help the performers to “brake” sooner at red lights?
A．Silence.
B．Loud music.
C．Quiet music.
D．Rock music.
72．Which of the following is NOT true of loud music?
A．It helped the performers to brake sooner at red lights.
B．lt helped the performers to be more careful.
C．It helped the performers to respond faster to objects suddenly stepping in the way.
D．It can do more good than harm to drivers.
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