单项选择题

A．For the sake of decoration.
B．To show their male dominance.
C．For self-protection.
D．To attract animals in different sex.
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单项选择题
A．Daughter and father.B．Secretary and manager.C．Student and teacher.D．Patient and doctor.
A．Daughter and father.
B．Secretary and manager.
C．Student and teacher.
D．Patient and doctor.
单项选择题
A．Because the fish population is increasing.B．Because the temperature there is increasing.C．Because the temperature there is decreasing.D．Because the ozone layer is disappearing.
A．Because the fish population is increasing.
B．Because the temperature there is increasing.
C．Because the temperature there is decreasing.
D．Because the ozone layer is disappearing.
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