单项选择题

Employees in chemical factories are entitled to receive extra pay for doing hazardous work.

A. poisonous
B. difficult
C. dangerous
D. harmful
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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 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
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