单项选择题

She has spent twenty years in researching the cause of lung cancer. Her achievements are of ______ the highest praise.

A．worthy
B．worth
C．deserved
D．valuable
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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
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
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