单项选择题

The designer has applied for a ______ for his new invention.

A．tariff
B．discount
C．version
D．patent
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单项选择题
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
单项选择题
I am afraid that you have to alter your ______ views in light of the tragic news that has just arrived.
A．indifferent
B．distressing
C．optimistic
D．pessimistic
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