单项选择题

Often such arguments have the effect of （）rather than clarifying the issues involved.

A．obscuring
B．prejudicing
C．tackling
D．blocking

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单项选择题
He blew out the candle and （）his way to the door.

A．converged
B．groped
C．strove
D．wrenched
单项选择题
Hill slopes are cleared of forests to make way for crops, but this only （）the crisis.

A．accelerates
B．prevails
C．ascends
D．precedes
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