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

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

游客2024-01-17  49
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. 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 " beriberi" . 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 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. [br] The chickens Eijkman noticed in the hospital yard______.
选项 A、couldn’ t digest the polished rice
B、proved "beri-beri" is caused by germs
C、were later cooked for the patients’ food
D、were suffering from "beri-beri"
答案 D
解析 本题考查考生对细节的把握。A、C项文中并未提到。根据第三段第一句话可知。艾克曼是发现吃病人剩饭的鸡患这种病后，他认为他的理论被证实，故B项不准确。故选D。
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