单项选择题

A．There are 13 students in our class.
B．30 come from other provinces.
C．There are 43 students in our class.
D．13 students come from other provinces.
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单项选择题
The reason that water problem will become more and more serious is ______. A) decrease in rainfall C) increase in wastes B) high temperature D) the waste of water
The reason that water problem will become more and more serious is ______.
A) decrease in rainfall C) increase in wastes
B) high temperature D) the waste of water
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