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
The fuel of the continental missile is supposed to be ______ by this device.
A.ignited
B.lighted
C.fired
D.inspired
单项选择题
In spite of the ______ economic forecasts, manufacturing output has risen slightly.
A.gloomy
B.miserable
C.shadowy
D.obscure
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