His ______ brain has worked away on the idea of a universal cure.[2006]A.richB.quickC.prod

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His ______ brain has worked away on the idea of a universal cure.[2006]

A.rich

B.quick

C.productive

D.fertile

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。