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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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