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

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

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问题 Smoke particles and other air pollutants are often trapped in the atmosphere, thus forming dirty fog.
选项 A、caught
B、constrained
C、concealed
D、concentrated
答案A
解析 题干：烟雾微粒和其他空气污染物往往被困在大气中，这样就形成了“脏雾”。trapped使陷入，使困住。caught被抓住，被困住；constrained被迫的；concealed隐蔽，隐藏；concentrated集中。故答案选A。
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