2. 考研
  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.

admin2013-06-12  57
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 trapped使陷入，使团住。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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