Scientists are increasingly that the earth is getting hotter because of carbon dioxide an

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(答案→)A. convinced
B. confident
C. concerned
D. conscious
解析：考查词义辨析。convinced 相信，confident 自信的，concerned 关注的，conscious 有意识的，短语：be convinced that 相信，句意：科学家们越来越相信由于二氧化碳和其它气体地球会变得越来越热。根据语境所以选A。