单项选择题
Glass-fiber cables can carry hundreds of telephone conversations ______.
A. spontaneously
B: simultaneously
C. immediately D. immiscibly
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单项选择题
The failure of the experiment to produce the expected result should alone be ______ to your carelessness.
A．prescribed
B．ascribed
C．distributed
D．contributed
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单项选择题
No ______is given at this shop; payment must be in cash,
A．currency
B．coin
C．money D, credit
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