单项选择题

We were warned that even a slight ______ in calculation might ruin the whole project.

A．mistake
B．fault
C．flaw
D．error
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单项选择题
Is that a(n) ______ Roman statue, or a modern copy
A．authentic
B．true
C．legitimate
D．authorized
单项选择题
It took a week of investigation to get a reasonably ______ account of the accident.
A．accurate
B．precise
C．strict
D．positive
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