问答题

We learn from Paragraphs 3&4 that______.
A.America is no more the world's No. 1 engine for innovation
B.America's dominance in research is not as eminent as before
C.China spends twice more on R&D compared with America
D.Chinese investment has doubled from 2000 to 2010

A.
A.America
B.America's
C.China
D.Chinese
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