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
Parents often faced the ______ between doing what they felt was good for the development of the child and what they could stand by way of undisciplined noise and destructiveness.
A．junction
B．premise
C．paradox
D．dilemma
单项选择题
The old building is in a good state of ______ except for the wooden floors.
A．observation
B．preservation
C．conservation
D．compensation
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