◎ 题干
A giant helium(氦) balloon is telling residents of Paris how good or bad the air quality is. When it’s good, the balloon ----measuring 22 meters wide and 32 meters high---shines green. _________, it’s red.
A.Though terrible B.Whenever good C.If worse D.When bad
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◎ 解析
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◎ 知识点
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