单项选择题

Smart is in rather poor health and is ________ colds.

A．responsive to
B．responsible for
C．subject to
D．exposed to
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单项选择题
Don't worry about your child, his temperature is only slightly above ________.
A．average
B．usual
C．regular
D．normal
单项选择题
At the meeting both sides exchanged their views on a wide ________ of topics they were interested in.
A．extent
B．number
C．collection
D．range
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