单项选择题

A．a vote of competence
B．a veto of competence
C．a veto of confidence
D．a vote of confidence
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单项选择题
A．to stop a possible comet-Earth collisionB．to knock a chunk out of the comet and see what lies underneathC．to test a newly developed missileD．to destroy the comet
A．to stop a possible comet-Earth collision
B．to knock a chunk out of the comet and see what lies underneath
C．to test a newly developed missile
D．to destroy the comet
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