单项选择题

They declared that all discrimination based on either race or religion was a threat to national unity and a __________ to American democracy.

A．maneuver
B．melody
C．menace
D．miniature
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单项选择题
As these barriers __________, European automakers will be exposed to the kind of competition their counterparts have faced in Asia and North America.
A．compress
B．condense
C．crumble
D．cripple
单项选择题
A Pan American Boeing 707 approaching Bali's international airport __________ into a mountain on April 22, killing all 107 persons on board.
A．smashed
B．fractured
C．cracked
D．shattered
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