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[单选题]

What does the new study by the two universities say about recent crop improvement efforts?

A.They fail to produce the same remarkable results as before the 1980s．

B.They contribute a lot to the improvement of human food production．

C.They play a major role in guaranteeing the food security of the world．

D.They focus more on the increase of animal food than human food grains．

参考答案与解析：

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