单项选择题

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

A. constrained
B. caught
C. concealed
D. concentrated

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单项选择题
The Second Hague Disarmament Conference of 1907 was marked more by discord than discourse, a sign of the deteriorating world situation.（）

A. facilitating
B. upgrading
C. justifying
D. worsening
单项选择题
Grocery prices were boosted again last month.（）

A. attacked
B. stabilized
C. fixed
D. raised
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