With the word“PM2．5 appearing in media reports，people pay greater attention to it and seek health tips for smoggy days．
A. constantly
B. instantly
C. rarely
D. directly
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(答案→)A. constantly
B. instantly
C. rarely
D. directly
解析：句意：随着词汇““PM2．5不断地出现在媒体的报告中，人们更加关注雾霾和寻求在。雾霾中保持健康的建议。Constantly不断地；instantly立即；rarely很少地；directly直接地，选A。