北京：2009年4月成人英語三級真題B卷
來源：來源于網絡發布時間：2009-04-18
育路成人高考培訓咨詢
幫助希望進入名校的在職人員實現他們的本、專科大學夢想
Passage 2
Questions 6 to 10 are based on the following passage:
The vitamins necessary for a healthy body are normally supplied by a good mixed diet, including a variety of fruits and green vegetables. （78） It is only when people try to live on a very restricted diet that it is necessary to make special provision to supply the missing vitamins.
An example of the dangers of a restricted diet may be seen in the disease known as beri-beri. （79） It used to distress large numbers of Eastern peoples who lived mainly on rice. In the early years of this century, a scientist named Eijkman was trying to discover the cause of beri-beri. At first he thought it was caused by a germ. He was working in a Japanese hospital, where the patients were fed on polished rice which had the outer husk removed from the grain. It was thought this would be easier for weak and sick people to digest.
Eijkman thought his germ theory was confirmed when he noticed the chickens in the hospital yard, which were fed on leftovers （剩飯） from the patients' plates, were also showing signs of the disease. He then tried to isolate the germ, but his experiments were interrupted by a hospital official, who declared that the polished rice, even though left over by the patients, was too good for chickens. It should be recooked for the patients, and the chickens should be fed on cheap rice with the outer layer still on the grain.
Eijkman noticed that the chickens began to recover on the new diet. He began to consider the possibility that eating unpolished rice somehow prevented or cured beri-beri —— even that a lack of some element in the husk might be the cause of the disease. Indeed this was the case. The element needed to prevent beri-beri was shortly afterwards isolated from rice husks and is now known as vitamin B. Nowadays, this terrible disease is much less common thanks to our knowledge of vitamins.
6. A good mixed diet ．
A. normally contains enough vitamins
B. still needs special provision of vitamins
C. is suitable for losing weight
D. is composed of fruits and vegetables
7. The disease beri-beri ．
A. kills large numbers of Eastern peoples
B. is a vitamin deficiency （缺乏） disease
C. is caused by diseased deer
D. can be caught from diseased chickens
8. The chickens Eijkman noticed in the hospital yard ．
A. couldn't digest the polished deer
B. proved beri-beri is caused by germs
C. were later cooked for the patients' food
D. were suffering from beri-beri
9. According to Eijkman, polished rice ．
A. was cheaper than unpolished rice
B. was less nourishing （有營養的） than unpolished rice
C. was more nourishing than unpolished rice
D. cured beri-beri
10. The chemical substance missing from polished rice ．
A. was vitamin B
B. did not affect the chickens
C. was named the Eijkman vitamin
D. has never been accurately identified
業內名師團隊，班主任一對一服務，全面覆蓋考點，一次考試，保上名校。 ！
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