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．Eleven dollars for the event.B．Five dollars for the event.C．One dollar per mile.D．Twenty-five cents or less per mile.
A．Eleven dollars for the event.
B．Five dollars for the event.
C．One dollar per mile.
D．Twenty-five cents or less per mile.
单项选择题
A．He had already paid for the meals when he bought his ticket.B．He had to pay for every meal he had on board.C．The meals were served free of charge.D．He could not have the bill.
A．He had already paid for the meals when he bought his ticket.
B．He had to pay for every meal he had on board.
C．The meals were served free of charge.
D．He could not have the bill.
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