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a.
n.
同義:
a.北極的,寒冷的
反義:
a.「北極的」的反義字
同義參見:
以上來源於:《英漢大辭典》
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單選題
In the 1980s, British scientists were the first to notice a(n) ___ thinning of the ozone layer above Antarctic. To stop the hole from growing larger at a fast pace, fue world has done a lot.
(A) optimistic
(B) casual
(C) dramatic
(D) economical