单项选择题

The public and authorities are particularly concerned about the ______ from the unclear power stations.

A．extracts
B．injections
C．discharges
D．drainage
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单项选择题
When Americans tell a joke, they often ______
A．poke people in the ribs
B．pat people on the arm
C．stroke people's hair
D．give people a big hug
单项选择题
The old lady spent a week ______ for her little daughter's wedding.
A．messing up
B．messing around
C．stitching up
D．slacking up
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