单项选择题

Language is not ______ throughout the country but falls into dialects.

A．constant
B．uniform
C．steady
D．steadfast
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单项选择题
Advertising media like direct mail, radio, television and newspapers ______ to increase the sales of industrial products.
A．have been used
B．will be used
C．is being used
D．has been used
单项选择题
Evidence came up ______ the old man was the very person who had killed the little girl.
A．what
B．that
C．which
D．whose
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