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  3. The vitamins necessary for a healthy body are normally supplied by a good mixed diet (饮食),including a variety of fruits and gree

The vitamins necessary for a healthy body are normally supplied by a good mixed diet (饮食),including a variety of fruits and gree

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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.
A good mixed diet________.
选项 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
答案A
解析 根据关键词定位到第一段第一句话“The vitamin necessary for…by a good mixed diet…”。本题考查考生对文章细节的把握。根据第一段第一句话可知混合性的食物能够提供满足健康机体所需的维生素。故A正确。B应该说的是restricted diet。C项未提到。D项并不全面，前面只说混合性食物包含蔬果类，而不是由蔬果构成。故选A。
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