单项选择题

A．In the first semester.
B．In the second semester.
C．In the third semester.
D．In the fourth semester.
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单项选择题
A．Separating different types of garbage.B．Disposing of trash properly.C．Having a family clean-up party.D．Saving water whenever using it.
A．Separating different types of garbage.
B．Disposing of trash properly.
C．Having a family clean-up party.
D．Saving water whenever using it.
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