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In____review of 44 studies, American researchers found that men and women ____who ate six key foods daily cut the risk of ______ heart disease by 76%.  
A.a; theB.the; aC.a; 不填D.不填; a
C  
 一份44个研究课题组成的调查显示,故第一空选冠词a;第二空 heart disease(心脏病)习惯上不用惯词。 
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