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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 feed than human food grains.
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【简答题】化脓性脑膜炎90%以上的病例在出生后________至________之间发生。
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