8. The chickens Eijkman noticed in the hospital yard ．
A. couldn't digest the polished deer
B. proved beri-beri is caused by germs
C. were later cooked for the patients' food
D. were suffering from beri-beri
9. According to Eijkman, polished rice ．
A. was cheaper than unpolished rice
B. was less nourishing （有营养的） than unpolished rice
C. was more nourishing than unpolished rice
D. cured beri-beri
10. The chemical substance missing from polished rice ．
A. was vitamin B
B. did not affect the chickens
C. was named the Eijkman vitamin
D. has never been accurately identified
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