第一句:Healthy care plans are needed in all big cities to prevent ______ spreadof AIDS. 空内填the。
第二句:In ______ review of 44 studies, American researchers found that menand women who ate six key foods daily cut the risk of _______ heart disease by79%. 空内分别填“a”和“不填”,请分别解释一下!第一句话的空和第二句的第二个空为什么是不一样的?我觉得同样是疾病,前面的冠词是不一样的呢?