单项选择题

Educational TV stations offer teaching in various ______ ranging from home nursing to art appreciation.

A．courses
B．directions
C．points
D．subjects
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单项选择题
The ______ of human knowledge are being pushed further.
A．boundaries
B．borders
C．limits
D．edges
单项选择题
By 1900 the American automobile age had begun--12 companies produced a ______ of more than 4,000 cars.
A．number
B．quantity
C．total
D．whole
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