单项选择题

______ on a clear day, far from the city crowds, the mountains give him a sense of in- finite peace.

A．If walking
B．Walking
C．While walking
D．When one is walking
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单项选择题
______ that my head had cleared, my brain was also beginning to work much better.
A．For
B．Now
C．Since
D．Despite
单项选择题
The knee is the joint ______ the thigh bone meets the large bone of the lower leg.
A．when
B．where
C．why
D．which
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