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

There are many reasons why Americans like fast food EXCEPT that ______.

A．fast food is very cheap
B．fast food is very delicious
C．only a little of fast food makes you feel full
D．fast food is nutritionally balanced

单项选择题

What does the second paragraph mainly discuss

A．Fast food can develop many illnesses.
B．Fast food meals are not nutritionally balanced.
C．Fast food meals lack of vegetables and fruit.
D．Fast food contains too much sugar.

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