单项选择题

A. Yes, I’m free.
B. No, I’m doing my homework.
C. Don’t ask me.
D. No, nothing special.
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单项选择题
There are three colors in the British flag, ______ red, white and blue.
A. rarely
B. namely
C. really
D. naturally
单项选择题
Most people in the United States buy insurance ______.
A. to pay for their own medical care
B. to help to live on their low incomes
C. to improve the national health care service
D. to solve one of the important political problems
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