单项选择题

A．25 percent.
B．5 percent.
C．45 percent.
D．10 percent.
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单项选择题
A．Mom than 16 million tons.B．More than 22 million tons.C．More than 34 million tons.D．More than 60 million tons.
A．Mom than 16 million tons.
B．More than 22 million tons.
C．More than 34 million tons.
D．More than 60 million tons.
单项选择题
A．2.B．3.C．4.D．1.
A．2.
B．3.
C．4.
D．1.
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