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(chǎn); theB．the; aC．a(chǎn); 不填D．不填； a
C
一份44個研究課題組成的調(diào)查顯示，故第一空選冠詞a;第二空 heart disease（心臟病）習(xí)慣上不用慣詞。
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