单项选择题

A．Soil.
B．Human population.
C．Forest.
D．Water.
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单项选择题
The passage gives an insight into how the United States could develop a new transport policy for the 21st century.
A．Y
B．N
C．NG
单项选择题
A．1016.B．1060.C．508.D．580.
A．1016.
B．1060.
C．508.
D．580.
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