单项选择题

According to the passage, Vienna was once a center of ______.

A．traffic
B．trade and science
C．art and music
D．and
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单项选择题
A．refusesB．agreesC．failsD．hates
A．refuses
B．agrees
C．fails
D．hates
单项选择题
A．uninterestingB．unreasonableC．unforgettableD．unpleasant
A．uninteresting
B．unreasonable
C．unforgettable
D．unpleasant
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