单项选择题

Her treatment of the subject is exhaustive.

A．very boring
B．very thorough
C．very interesting
D．very touching
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单项选择题
The water in this part of the river has been contaminated by sewage (污水).
A．polluted
B．downgraded
C．mixed
D．blackened
单项选择题
The price of vegetables fluctuates according to the weather.
A．jumps
B．rises
C．falls
D．changes
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