2. 外语
  3. A mirage occurs when a layer Aof warm air Bnext the ground is trapped Cby cooler air that is Dabove it.

A mirage occurs when a layer Aof warm air Bnext the ground is trapped Cby cooler air that is Dabove it.

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问题 A mirage occurs when a layer Aof warm air Bnext the ground is trapped Cby cooler air that is Dabove it.
选项 A、 
B、 
C、 
D、 
答案B
解析 Next is an incomplete compound preposition. Correction: next to.
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