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  3. The vitamins necessary for a healthy body are normally supplied by a good m

The vitamins necessary for a healthy body are normally supplied by a good m

游客2024-01-15  174
问题      The vitamins necessary for a healthy body are normally supplied by a good mixed diet (饮食), including a variety of fruits and green vegetables. (79)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”. (80) 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 (外壳) 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 (剩饭) 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 rebooked 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.  [br] The disease “beri-beri”______.
选项 A、kills large numbers of Eastern peoples
B、is a vitamin deficiency (缺乏) disease
C、is caused by diseased rice
D、can be caught from diseased chickens
答案 B
解析 本题考查考生根据文章内容的推理判断的能力。A项是对第二段第二句话的曲解，distress (使忧伤) 不等于kill。C项和D项是对rice和chicken的曲解。而根据第二段第一句可知这种病与restricted diet有关，而第一段说若只以restricted diet为食，需要额外补充维生素，因此可以推断出脚气病是一种维生素缺乏症。
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