Smoke particles and other air pollutants are often trapped in the atmosphere, th

游客2025-01-31 9

问题 Smoke particles and other air pollutants are often trapped in the atmosphere, thus forming dirty fog.

选项 A、constrained
B、caught
C、concealed
D、concentrated

答案 B

解析题干中的trap意为“困住”。A项“约束”；B项“抓住”；C项“隐藏”；D项“专心于”。只有B项与题干中划线单词意义相近。

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