单项选择题

A．To suggest candidates.
B．To raise teachers’ salaries.
C．To make a platform.
D．To do fund-raising.
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单项选择题
A．Attracting mates.B．Staking their territories.C．Hearing each other.D．Sleeping.
A．Attracting mates.
B．Staking their territories.
C．Hearing each other.
D．Sleeping.
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.
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