单项选择题

The subject of his lecture was so ______ that few people could understand it.

A．ambiguous
B．obscure
C．conspicuous
D．dim
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单项选择题
Age alone won’t ______ me from an expedition to the North Pole.
A．precipitate
B．predict
C．precede
D．preclude
单项选择题
I may go to Japan, but in any event, I will pay you a visit in the summer vacation. The underlined word means
A．situation.
B．circumstance.
C．accident.
D．case.
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