单项选择题

What can you do to ensure that you will stay healthy

A．be assured
B．insist
C．prove
D．secure
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单项选择题
The town is famous for its magnificent church towers.
A．distinguished
B．contemporary
C．specialized
D．specified
单项选择题
We have to think very carefully before we take any action, because it's a very serious situation we have encountered.
A．ideal
B．favourable
C．good
D．severe
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