单项选择题

A．Next morning.
B．This afternoon.
C．Before lunch.
D．After lunc
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单项选择题
A．Too much algae.B．Excessive recreational use.C．Lack of adequate rainfall.D．Too much evaporation.
A．Too much algae.
B．Excessive recreational use.
C．Lack of adequate rainfall.
D．Too much evaporation.
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