北京 成人英语三级真题

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.转自学易网 Eijkman thought his germ theory was confmned 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.转自学易网

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 thiswas the case. The element needed to prevent “beri-beri” was shortly afterwards isolated from Ace husks and is now known as vitamin B. Nowadays， this terrible disease is much less common thanks to our knowledge of vitamins.

11. A good mixed diet______.转自学易网

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

12. The disease “beri-beri”______.

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

13. The chickens Eijkman noticed in the hospital yard______.

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“beA-ben”