单项选择题

Since our knowledge is （）none of us can exclude the possibility of being wrong.

A．controlled
B．restrained
C．finite
D．delicate

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单项选择题
In some remote places there are still very poor people who can't afford to live in （）conditions.

A．gracious
B．decent
C．honorable
D．positive
单项选择题
Police and villagers unanimously （）the forest fire to thunder and lightning.

A．ascribed
B．approached
C．confirmed
D．confined
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