单项选择题

The post office says the stamp is useless when （）

A．you buy it
B．you write a letter
C．put a letter into a postbox
D．it has a postmark on it

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热门试题

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

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