单项选择题

A．Good luck.
B．His hard work.
C．His friend Paul.
D．Good timing.
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单项选择题
Slightly less than a third of CO2 emissions in the United States are caused by deforestation.
A．Y
B．N
C．NG
单项选择题
A．Vacations.B．Wages.C．Overcrowded classrooms.D．Paid sick leaves.
A．Vacations.
B．Wages.
C．Overcrowded classrooms.
D．Paid sick leaves.
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