问题描述：
be good at与 do well in
be good at = do well in
be good at doing sth = do well in doing sth.
It is good at riding a bike.
It does well in riding a bike.
be good at = do well in
be good at doing sth = do well in doing sth.
It is good at riding a bike.
It does well in riding a bike.
问题解答：
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