单项选择题

A．Attracting mates.
B．Staking their territories.
C．Hearing each other.
D．Sleeping.
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单项选择题
A．It’s difficult to find birds for recording.B．It’s difficult to find quiet areas for recording.C．It’s difficult to find animals for recording.D．It’s difficult to find mammals for recording.
A．It’s difficult to find birds for recording.
B．It’s difficult to find quiet areas for recording.
C．It’s difficult to find animals for recording.
D．It’s difficult to find mammals for recording.
单项选择题
A．For scientific study.B．For field guides.C．For entertainment.D．For some film background sounds.
A．For scientific study.
B．For field guides.
C．For entertainment.
D．For some film background sounds.
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