The medical research amply demonstrates that regular exercise strengthens the he

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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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Adiscussionoftheinterrelationbetweenresearchandtheorysuggestsaprecise