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    15、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

    15、B

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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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