2. 外语
  3. Nowadays it is understood that a diet, which contains nothing harmful may yet result in serious disease if certain important de

Nowadays it is understood that a diet, which contains nothing harmful may yet result in serious disease if certain important de

admin2010-05-26  80
问题      Nowadays it is understood that a diet, which contains nothing harmful may yet result in serious disease  if certain important dements are missing. These elements are called "vitamins". Quite a number of such substances are known and they are given letters to identify them, A, B, C, D, and so on. Different diseases are associated with deficiencies of particular vitamins. The vitamins necessary for a healthy body are normally supplied by a good mixed diet, including a variety of fruit and green vegetables, h is only when people try to live on a very restricted diet, say during extended periods of religious fasting, or when trying to lose weight, that it is necessary to make special provision to supply the missing vitamins.
    One example of the dangers of a restricted diet may be seen in the disease known as beriberi(脚气病), which used to afflict large numbers of Eastern peoples who lived mainly on rice. In the early years of this century, a Dutch scientist called Eijkman was trying to discover the cause of beriberi. At first he thought it was transmitted by a germ. He was working in a Japanese hospital, where the patients were fed on rice which had had the outer husk removed from the grain. It was thought this would be easier for weak, sick people to digest. Eijkman thought his germ theory was confirmed when he noticed, the chicken in the hospital yard, which were fed on scraps from the patients’ plates, were also showing signs of the disease. He then tried to isolate the germ fie thought was causing the disease, but his experiments were interrupted by a hospital official, who claimed that the huskless rice, even though left over by the patients,  was too good for chickens. It should be recooked and the chickens fed on cheap, coarse rice with file outer covering still on the grain. Eijkman noticed that the chickens began to recover on the new diet. He began to consider the possibility that eating unmilled rice somehow prevented or cured beriberi—even that a lack of some ingredient in the husk might be the cause of the disease.
    Indeed this was the case. The element needed to prevent beriberi was shortly afterwards isolated from rice husk and is now known as vitamin B. The milled rice, though more expensive, was in fact perpetuating the disease the hospital was trying to cure. Nowadays, this terrible disease is much less common;  thanks to our knowledge of vitamins.
Deficiencies of the various vitamins______.
选项 A、cause identical diseases
B、are no; serious except in the case of vitamin C
C、cause different diseases
D、are often caused by scurvy
答案C
解析 细节题。本题问的是：缺乏不同的维生素会______。依据文章第1段第4句“Different diseases are associated with deficiencies of particular vitamins”可知，不同的疾病与缺乏某种特定的维生素有关，因此正确答案是C 。
转载请注明原文地址:https://kaotiyun.com/show/9kV7777K
0

大学英语四级

相关试题推荐
随机试题
最新回复(0)