The word "spectres" in the second paragraph is closest in meaning to

题库:综合类 类型:最佳选择题 时间:2017-07-03 03:15:42 免费下载:《单选题》Word试卷

The word "spectres" in the second paragraph is closest in meaning to
A."pollution".
B."carbon dioxide".
C."aerosols".
D."ghosts".

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