单项选择题

A．The water turns gray.
B．It grows again.
C．Life on earth improves.
D．Life on earth dies.
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单项选择题
A．Selecting the necessary equipment.B．Finding a climbing partner.C．Increasing upper-body strength.D．Discussing popular climbing sites.
A．Selecting the necessary equipment.
B．Finding a climbing partner.
C．Increasing upper-body strength.
D．Discussing popular climbing sites.
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