单项选择题

A．In a shopping mall.
B．In the dormitory.
C．In the office.
D．In a library.
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单项选择题
A．Soil.B．Human population.C．Forest.D．Water.
A．Soil.
B．Human population.
C．Forest.
D．Water.
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
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