单项选择题

Very few people could understand the lecture the professor delivered because its subject was very （）

A．intriguing
B．indefinite
C．obscure
D．dubious

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We work to make money, but it's a （）that people who work hard and long often do not make the most money.

A．dilemma
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C．prejudice
D．paradox
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We've just installed a fan to （）cooking smells from the kitchen.

A．eject
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