单项选择题

All houses within 100 metres of the seas are at risk of flooding.

A．out of control
B．in danger
C．between equals
D．in particular
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单项选择题
We are aware of the potentialproblems.
A．global
B．ongoing
C．possible
D．central
单项选择题
We must get to the rootof the problem.
A．approach
B．cause
C．heart
D．solution
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