圆M的圆心在直线y=-2x上，经过点A(2,-1)，且与直线 x+y=1相切，则圆M的方程为( )

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A： ${(x + 1)}^{2} + {(y - 2)}^{2} = 2$

B： ${(x + 1)}^{2} + {(y + 2)}^{2} = 2$

C： ${(x - 1)}^{2} + {(y + 2)}^{2} = 2$

D： ${(x - 1)}^{2} + {(y - 2)}^{2} = 2$

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C

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Spring Festival is our Chinese people's festival. There are twelve names. We call it the year of sheep, the year of dog… and the year of monkey. Before the day of the festival, people are very busy(忙于 ) shopping and cleaning their houses. On the Eve, there is a big family dinner. After dinner, all the family stay up late( 守夜 ) to welcome the new year. It is the middle of the night. We have some dumplings and watch many good TV programs( 节目). On the first day of the New Year, people wear their new clothes to go to their friends' houses. They say “ Happy Spring Festival” to each other. Children will get some money from their parents or other people. So people especially( 特别) children like Spring Festival very much.

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