问题

_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; the;;; ;;;;;
B:the; a;;;;;;;;
C:a; 不填;;;;;;;
D:不填; a;
B:the; a;;;;;;;;
C:a; 不填;;;;;;;
D:不填; a;
正确答案是:
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