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
Before he sank into unconsciousness, he ________ towards the window and managed to open it.
A．fought
B．struggled
C．walked
D．dragged
单项选择题
The world's governments have done ________. nothing to combat the threat of nuclear accidents.
A．inherently
B．vitally
C．virtually
D．identically
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