单项选择题

The two countries achieved some progress in the sphere of trade relations, traditionally a source of ______ irritation.

A．mutual
B．optional
C．neutral
D．parallel
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单项选择题
Member states had the option to ______ from this agreement with one year's notice.
A．deny
B．object
C．suspect
D．withdraw
单项选择题
Picasso was an artist who fundamentally changed the ______ of art for later generations.
A．philosophy
B．concept
C．viewpoint
D．theme
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