单项选择题

The creation of UN was, perhaps, the most ______ achievement of the 20th century.

A．obscure
B．notable
C．acute
D．objective
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单项选择题
A physical examination is a ______ to joining the army.
A．parliamentary
B．preliminary
C．elementary
D．complementary
单项选择题
Some people think it's ______ to smoke with a cigarette holder.
A．flexible
B．sophisticated
C．versatile
D．productive
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