单项选择题

A．Garbage Can Be Changed into Fertilizer.
B．Overcoming the Problem of Waste.
C．Making Buildings with Garbage.
D．Large Cities Are Anything but Beautiful.
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单项选择题
According to behaviorism, all human actions _________.
A．are based on stimulus and response
B．have no bearing on human drives
C．are supposed to be highly motivated
D．are of a great mystery
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