问题补充:
rise in carbon dioxide is causingsteady increase in global warming.
A. 不填; a
B. The; a
C. The;不填
D. A;the
答案:
A. 不填; a
(答案→)B. The; a
C. The;不填
D. A;the
解析:考查冠词,包括定冠词the和不定冠词a/an,第一个空特指二氧化碳上升,所以用定冠词the,第二空表示一个稳步增长,因为单词steady以辅音字母s开头,所以用不定冠词a,所以选B
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