单项选择题

There are certain ______ when you have to interrupt people who are in the middle of doing something.

A．chances
B．situations
C．occasions
D．opportunities
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单项选择题
Today the small town is better ______ against flood than it was 20 years ago.
A．protected
B．prevented
C．preserved
D．prepared
单项选择题
There is a beautiful ______ of pine forest near my country house.
A．extension
B．length
C．spell
D．stretch
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