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单项选择题
What is the main idea of the news item
A．Somalia is re-infected with polio virus.
B．Somalia has successfully eradicated polio.
C．Somalia suffers from indigenous polio.
D．Polio still persists in developing countries.
单项选择题
How many people were on beard when the tour bus crashed
A．Five.
B．Six.
C．Seven.
D．Forty-fiv
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