问题
选择题
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
答案
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。