单项选择题

How long does the mother wait for the young to hatch

A．Five weeks.
B．Ten weeks.
C．Twelve weeks.
D．Fifteen weeks.
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单项选择题
A．valueB．ratioC．rateD．speed
A．value
B．ratio
C．rate
D．speed
单项选择题
Which of the following is true
A．Water can be used only once.
B．Used water can be recycled.
C．Recycled water is unfit for drinking.
D．Only rain water is drinkable.
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