单项选择题

From the passage we know that joints and muscles perform best when （）.

A．they are twisted and stretched
B．they are in their normal positions
C．they are tested with a human "guinea pig"
D．they are tested with electronic instruments

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单项选择题

Most of us use our right hands （）the left ones.

A．as well as
B．not so well as
C．much better than
D．more better than

单项选择题

21（）

A．bus
B．car
C．bike
D．boat