单项选择题

A．keeping the peace
B．helping in the fight against cancer and AIDS
C．helping with elections in many countries
D．bringing relief to victims of disasters
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单项选择题
A．on Friday morningB．on Friday afternoonC．at dusk on FridayD．on Friday night
A．on Friday morning
B．on Friday afternoon
C．at dusk on Friday
D．on Friday night
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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