单项选择题

A．Weights and measurements.
B．Political systems.
C．Employment.
D．Money.
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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
A．He relaxes.B．He goes fishing.C．He goes to work.D．He works at home.
A．He relaxes.
B．He goes fishing.
C．He goes to work.
D．He works at home.
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