首页
登录
职称英语
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
45
管理
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 chemical substance missing from polished rice______
选项
A、was vitamin B
B、did not affect the chickens
C、was named the Eijkman vitamin
D、has never been accurately identified
答案
A
解析
本题考查考生对文章细节的理解。根据文章最后一段可以知道,精米中所缺少的物质是维生素B。因此选A。B项与文意相反。C项未提及。D项与文意相反。
转载请注明原文地址:https://tihaiku.com/zcyy/3364626.html
相关试题推荐
Oneofthebestwaysforpeopletokeepfitisto________healthyeatinghabits.A
Vitaminsdonotprovideenergy,nordotheyconstructorbuildanypartoftheb
Itisnecessarythatwe________haveagoodcommandofEnglishatcollege.A、mus
Normallyastudentmustattendanumberofcoursesinordertograduate,and
Normallyastudentmustattendanumberofcoursesinordertograduate,and
Normallyastudentmustattendanumberofcoursesinordertograduate,and
Inordertolearnaforeignlanguagewell,itisnecessarytoovercomethef
Thevitaminsnecessaryforahealthybodyarenormallysuppliedbyagoodm
MillionsofAmericanstakevitaminsandminerals,______thatthesepillscanhel
Itisnecessarythatwe______haveagoodcommandofEnglishatcollege.A、mustB、
随机试题
PASSAGETHREE[br]Accordingtothepassage,whatcancustomersdoinanAmerica
Whendidtheshoppingcenterplantoopen?[br][originaltext]Tofinishtod
Thesedayssearchingforanumber【C1】______telephonedirectoryseemsveryo
洗胃的目的是什么?
最准确地判定病人营养状况的方法为A.三头肌皮皱厚度 B.氮平衡试验 C.血清
如图所示,周长为24米的平行四边形绿化地被划分为三块区域,两边为三角形的花坛,中
某产品的寿命(单位:小时)服从参数λ=0.005的指数分布,则下列说法正确的有
A.IgG B.IgD C.IgE D.IgM E.IgA具有分泌片段的
在建筑内部装饰装修防火施工与验收,关于高分子合成材料的主控项目下列说法错误的是(
关于FIDIC《EPC交钥匙项目合同条件》特点的说法,正确的是()。A.适用于承
最新回复
(
0
)