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
1、B
科目：初中英語 來源： 題型：
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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