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The Canadian investigators think that

A. the ADR incidence figures from their research are surely very exact.
B. the ADR incidence figures from their research are probably too high.
C. the ADR incidence figures from their research are perhaps too low.
D. None of the above is true.

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根据材料请回答 41～45 题
Memory
One day more than fifty years ago, a young man had an accident on his motor-bike in which he suffered a few apparently minor injuries.There was a bruise (淤青) on the left side of his forehead and some slight bleeding from his left ear.He was taken to hospital for examination but X-rays did not reveal any other injuries. Nevertheless, the doctor who was treating him decided to keep him in hospital for further observations because the young man was having difficulty in speaking and seemed very confused.
At the time of the accident, the young man was 22 years old, and the date was Au-gust, 1933.A week later, he was able to carry on what seemed a perfectly normal conver－sation.However, he told the doctor that he was only 11 years old and that the date was February, 1922.What is more, he could not remember anything that had happened since 1922.For example, he could not recall having spent five years in Australia, or coming back to England and working for two years on a golf course.
As time went by, part of his memory of the eleven missing years come back.A few weeks later, he even remembered his years in Australia.But the two years of his life just before the accident were still a completely a blank.Three weeks after his injury, he went back to the village where he had been living for those two years.Everything seemed unfa-miliar and he did not recall ever having been there before.Despite this, he was able to take up his old job again in the village and to do it satisfactorily.But he often got lost when walking around the village and found it difficult to remember what he had done during the day.
Slowly, however, his memory continued to return so that, about ten weeks after the accident, he could even remember most of the previous two years.There remained only one complete gap in his memory： he could remember absolutely nothing about what.he had done a few minutes immediately before the accident or the accident itself. This part of his memory never came back.
第 41 题 When did the accident happen？

A. In February 1922.
B. A few years ago.
C. when the young man was in Australia.
D. Over half a century ago.

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The global decrease in investment should be changed____．

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The recent studies on genetic defects tell us __________

A. Some diseases result from an extra chromosome.
B. Some diseases are caused by a chromosome in short.
C. Faulty genes caused by mutation give rise to diseases like mongolism
D. Parents of mongoloid are likely to have more children of the kind.

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What is the writer's advice about alcohol before you give a speech？

A. Drink a little of it to feel all-powerful.
B. Don't drink it.
C. Dilute it with water.
Drink it two hours before you make a speech.

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The Canadian investigators think that

A. the ADR incidence figures from their research are surely very exact. B. the ADR incidence figures from their research are probably too high. C. the ADR incidence figures from their research are perhaps too low. D. None of the above is true.

The global decrease in investment should be changed____．

The recent studies on genetic defects tell us __________

What is the writer's advice about alcohol before you give a speech？

A. the ADR incidence figures from their research are surely very exact.
B. the ADR incidence figures from their research are probably too high.
C. the ADR incidence figures from their research are perhaps too low.
D. None of the above is true.