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The invention of artificial hearts marked a turning point in the battle       heart disease.
A.amongB.forC.againstD.between
C
介词辨析。A. 在……之中 B. 为了…… C. 针对 D. 在……之间。句意:在应对心脏病的战斗中,人造心脏的发明是一个转折点。故选C。
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