题目内容
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
B
|
题目内容
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
B
|