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.

admin2014-03-15  37
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
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