单项选择题

A．Ten-month frost.
B．Modification.
C．Humidity.
D．No summer.
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C
单项选择题
A．We should drink more hard water.B．We should drink more soft water.C．Ground water is good for the elderly people.D．Ground water has to be treated before we drink it.
A．We should drink more hard water.
B．We should drink more soft water.
C．Ground water is good for the elderly people.
D．Ground water has to be treated before we drink it.
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