21.While flying.a batmakes a sound which hits things and comes back to its ears.In this way it's able to know the things are and avoid bumping into them.A.how B.where C.what D.which 查看更多

 

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While flying,a bat(蝙蝠)makes a sound which hits things and comes back to its ears.In this way it's able to know           the things are and avoid bumping into them.

A.how                    B.where                  C.what                      D.which

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