Scientists are increasingly _____ that the earth is getting hotter because of carbon dioxide and other gases.
A．convincedB．confident C．concernedD．conscious
A
考查詞義辨析。convinced 相信，confident 自信的，concerned 關注的，conscious 有意識的，短語：be convinced that 相信，句意：科學家們越來越相信由于二氧化碳和其它氣體地球會變得越來越熱。根據(jù)語境所以選A。
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