单项选择题

There has been enough playing around, so let’s get down to business.（）

A. begin our work
B. make a deal
C. reach an agreement
D. change our plan

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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
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
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