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.
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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.
单项选择题
A．Buy a new watch.B．Go to bed earlier.C．See a doctor.D．Change his job.
A．Buy a new watch.
B．Go to bed earlier.
C．See a doctor.
D．Change his job.
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