Question

In __________ review off 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

Answer 1

C

解析:

第一空填不定冠词，表示“一次”；第二空不填冠词（或填零冠词)，因为此处是表泛指。