单项选择题

President Obama will arrive in Copenhagen ______ after it begins.
The conference lasted for ______.

A．one day
B．one week
C．two days
D．two weeks
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单项选择题
It’s the ______ time the World Economic Forum has been held in the city.
A．1st
B．2nd
C．3rd
D．4th
单项选择题
Which of the following countries is not affected by the current flood in West Africa
A．Sierra Leone. B．Niger.
C．Egypt.
D．Ghana.
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