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prosperity
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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.
A．In the first semester.
B．In the second semester.
C．In the third semester.
D．In the fourth semester.
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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