单项选择题

A．Write to Kate Ferguson.
B．Call the recreation center.
C．See the instruction after class.
D．Submit a form to the Van Howe Chemical Company.
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单项选择题
A．They are no longer produced.B．They are used up faster than they are created.C．The growing season of their source has become shorter.D．Many of their sources have become extinct.
A．They are no longer produced.
B．They are used up faster than they are created.
C．The growing season of their source has become shorter.
D．Many of their sources have become extinct.
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