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单项选择题
A．The President.B．The Federal Aviation Administration.C．The United States Congress.D．The Environmental Protection Agency.
A．The President.
B．The Federal Aviation Administration.
C．The United States Congress.
D．The Environmental Protection Agency.
单项选择题
A．the southern parts of the present U. S. AB．the eastern parts of the present U. S. AC．the western parts of the present U. S. AD．the northern parts of the present U. S. A
A．the southern parts of the present U. S. A
B．the eastern parts of the present U. S. A
C．the western parts of the present U. S. A
D．the northern parts of the present U. S. A
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