单项选择题

Very few people understood his lecture, the subject of which was very ______.

A．intelligible
B．obscure
C．dim
D．conspicuous
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The designer has applied for a ______ for his new invention.
A．tariff
B．discount
C．version
D．patent
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Over the last fifteen years, running has become a popular ______ for 30 million participants of all ages.
A．fantasy
B．pastime
C．symposium
D．penalty
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