单项选择题

Your collection of pictures must be very ___________ now that prices have increased so much.

A．priceless
B．worthless
C．valueless
D．costless
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单项选择题
Government opponents maintain that the level of any new tax should be ___________ to an individual's ability to pay.
A．united
B．linked
C．associated
D．combined
单项选择题
I'm afraid that you have to alter your _________ views in light of the tragic news that has just arrived.
A．distressing
B．optimistic
C．pessimistic
D．objective
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