单项选择题

______ computer is more essential to a modem business than typewriter.

A．The, the
B．/, /
C．A, the
D．The, a
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单项选择题
Accidents and exhaustion may force more than half the cyclists to drop out before reaching the ______.
A．dead line
B．end line
C．finish line
D．finishing line
单项选择题
Henry felt so hungry that he ordered a double ______ of fish.
A．piece
B．part
C．portion
D．section
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