单项选择题

A．200, 000 tons.
B．2 million tons.
C．20 million tons.
D．2,000 tons.
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单项选择题
A．By good sense of water waves made by quarries.B．By good sense of smell and electrical magnetic power.C．By good sense of light.D．By good sense of blood.
A．By good sense of water waves made by quarries.
B．By good sense of smell and electrical magnetic power.
C．By good sense of light.
D．By good sense of blood.
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