单项选择题

The population of cities in the Eastern and Northern areas of the United States is declining while（）southern cities is growing.

A. that in
B. that of
C. those of
D. those in

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单项选择题
Mrs. Smith went on a diet and in two months（）her weight to 110 pounds.

A. brought out
B. brought off
C. brought down
D. brought up
单项选择题
All（）is a continuous supply of food.

A. what is needed
B. the thing needed
C. for own needs
D. that is needed
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