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．Write their lab report.B．Find out Professor Smith’’s schedule.C．Interview some high school students.D．Finish their chemistry experiment.
A．Write their lab report.
B．Find out Professor Smith’’s schedule.
C．Interview some high school students.
D．Finish their chemistry experiment.
单项选择题
A．How we look at pain.B．To feel pain as much as possible.C．To show an interest in pain.D．To accept the pain reluctantly.
A．How we look at pain.
B．To feel pain as much as possible.
C．To show an interest in pain.
D．To accept the pain reluctantly.
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