单项选择题

A．About 3 days.
B．About a week.
C．About 28 days.
D．Not mentioned.
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A．supportiveB．negativeC．ambiguousD．cautious
A．supportive
B．negative
C．ambiguous
D．cautious
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A．Great BritainB．BulgariaC．ItalyD．Poland
A．Great Britain
B．Bulgaria
C．Italy
D．Poland
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