阿摩線上測驗
20. Through repeated experiments, Robert Koch discovered that anthrax, a disease killed thousands of cattle every year, was caused by certain germs, but how to cure it or how to prevent it was still beyond him.
(A)
(B)
(C)
(D)
(E)
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統計： A(15), B(61), C(17), D(3), E(7) #1985506
統計： A(15), B(61), C(17), D(3), E(7) #1985506
