单项选择题

A．School and Education.
B．Individuals in the United States.
C．Responsibilities as Citizens.
D．Tomorrow’’s Decision-makers.
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单项选择题
This passage explains the basic idea of natural gas and compares the performances of different types of NGVs.
A．Y
B．N
C．NG
单项选择题
A．Soil.B．Human population.C．Forest.D．Water.
A．Soil.
B．Human population.
C．Forest.
D．Water.
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