单项选择题

A．Too much algae.
B．Excessive recreational use.
C．Lack of adequate rainfall.
D．Too much evaporation.
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单项选择题
A．For a few days.B．For a few weeks.C．For a few months.D．For almost a year.
A．For a few days.
B．For a few weeks.
C．For a few months.
D．For almost a year.
单项选择题
A．They thought milk had great healing power.B．They thought milk could make their skin paler.C．They thought milk could stop beards growing.D．They rubbed bread soaked in milk on their faces.
A．They thought milk had great healing power.
B．They thought milk could make their skin paler.
C．They thought milk could stop beards growing.
D．They rubbed bread soaked in milk on their faces.
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