单项选择题

A(An) ______ water supply for city people is already a problem no government can take lightly.

A．crude
B．adequate
C．fresh
D．original
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单项选择题
In England, winter is ______ snow, long nights and very cold weather.
A．tied to
B．associated with
C．linked up
D．tied with
单项选择题
Mr. Foster has never been to China, ______ be knows very little about it.
A．consequently
B．continuously
C．constantly
D．consistently
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