单项选择题

A．At a cigarette store.
B．At a bus station.
C．At a gas station.
D．At Aunt Mary’’s.
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单项选择题
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单项选择题
The experts’’ study on the problem of erosion can ________.
A．warn people whose homes are in danger
B．provide an effective way to slow it down
C．help to its eventual solution
D．lead to its eventual solution
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