单项选择题

A．Since
B．Because
C．When
D．While
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单项选择题
Why did many southerners go to the Northeast and the Midwest during World, War Ⅱ
A．They wanted to learn to like country music.
B．They wanted to take music with them.
C．Country music was popular all over the country.
D．They wanted to work in the factories there.
单项选择题
One solution to the world’s food shortage problem could be found in ______.
A．foods from non-food materials
B．foods in plastic tubes
C．freeze-dried foods
D．eatable food packages
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