6、C “ Another example of the dangers ”
7、B A项的kill错 C项不是by diseased rice D项没提到
8、B Eijkman thought his germ theory was confirmed when he noticed the chickens in the hospital yard
9、B The white rice,though more expensive,was keeping alive the disease the hospital was trying to cure.
10、A The element needed to prevent beri-beri was shortly afterwards isolated from rice husks and is now known as Vitamin B.