单项选择题

A．The man should buy a meal ticket every month.
B．Individuals pay differently for the same meal.
C．Buying the meal ticket won’t save the man money.
D．The price of a meal varies according to the date.
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According to a WHO official, Dr. Mardel, the guidelines were flexible because______.
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B．no one knew where, when and in what setting SARS would return
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D．no one knew whether SARS would return or not
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