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; the
B. the; a
C. a; 不填
D. 不填； a
网友回答
A. a; the
B. the; a
(答案→)C. a; 不填
D. 不填； a
解析：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。