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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The weekend event will be centred around Wye College in Ashford, Kent, but the outing to the docks should be the highlight.
A. climax
B. pleasure
C. expectation
D. surprise
单项选择题
I couldn't work out why anyone would invent something so boring.
A. draw up
B. bring about
C. put forward
D. figure out
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