44. What was Nikolay Vavilov's main contribution mentioned in the passage?

(A)He amassed and stored seeds from many parts of the world.

(B)He invented a method for producing special crops faster.

(C)He warned people not to transport or trade seeds internationally.

(D)He discovered new machine-assisted farming technologies.

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統計: A(40), B(6), C(4), D(5), E(0) #3867846

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