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
|
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
|