问题
选择题
与直线x+2y-1=0关于点（1，-1）对称的直线方程为（ ）
A．2x-y-5=0
B．x+2y-3=0
C．x+2y+3=0
D．2x-y-1=0
答案
将x+2y-1=0中的x、y分别代以（2-x）、（-2-y），得（2-x）+2（-2-y）-1=0，即x+2y+3=0．
故选C
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与直线x+2y-1=0关于点（1，-1）对称的直线方程为（ ）
A．2x-y-5=0
B．x+2y-3=0
C．x+2y+3=0
D．2x-y-1=0
将x+2y-1=0中的x、y分别代以（2-x）、（-2-y），得（2-x）+2（-2-y）-1=0，即x+2y+3=0．
故选C
| 阅读下面的短文,根据短文内容完成表格中所缺缺信息,每空一词。 | |||||||||||||||||||
| What is your favorite cartoon?It may be difficult for you to decide.But for pianist Lang Lang,Tom and Jerry is the best one. When Lang Lang was two years old, he saw Tom playing the piano. This was his first time to enjoy western music and this experience encouraged him to learn to play the piano. His talent at the keyboard has taken him from Shenyang to the world. Lang Lang became a good piano student at three. Ever since,the boy has been doing better and better. In 1997, the 15-year-old boy studied at a famous American music college. Lang Lang's performances are energetic. He is well-known for making facial expressions and moving around while playing the piano. The road to success has never been easy. Lang Lang's father stopped his job to look after him, while his mother stayed in Shenyang to make money. But Lang Lang considers himself lucky and believes he should give something back. He has helped the children in poor areas a lot. | |||||||||||||||||||
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