The medical research amply demonstrates that regular exercise strengthens the heart, thus reducing the risk of heart attack.

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问题 The medical research amply demonstrates that regular exercise strengthens the heart, thus reducing the risk of heart attack.

选项 A、therein
B、thereof
C、thereby
D、therefrom

答案C

解析 therein(在那里,在其中);thereof(在其中,由此);thereby(因此,从而);therefrom(由此,从那里)。句意:这项医学研究充分地证明,经常锻炼可以增强心脏机能,从而减少心脏病发作的风险。所以选项C为答案。
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