The entire process is called the greenhouse effect, and most of it is caused by the prevalent greenhouse gas, water vapor.

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问题 The entire process is called the greenhouse effect, and most of it is caused by the prevalent greenhouse gas, water vapor.

选项 A、predominant
B、executive
C、superior
D、remarkable

答案A

解析 predominant:优越的;executive:行政的;superior:优秀的;remarkable:值得注意的。题中prevalent为“有优势的”,可知A项最适合要求。
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