单项选择题

A．value
B．ratio
C．rate
D．speed
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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.
单项选择题
Why does the crocodile put her babies in her mouth
A．To keep them warm.
B．To protect them from harm.
C．To transport them to the water.
D．To clean them.
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