Why are Chinese girls killed in china?

Chinese baby girls are killed in China because the Chinese people mostly want boys. The parents want boys because they think that when the boy grows up, he will take care of them when they are old. They know that if they have a girl, she won't be able to take care of them because she will already have kids and a house to take care of. I think it is wrong, but the reason that the Chinese kill girls is because they don't want them and they want boys. You can only have one child in China, so most of the time if a mother has a girl she will kill it, and then keep trying to have a boy only for that reason.There is a big mistake.Chinese girls can not be killed.Their mothers just take the abortion when it is known that unborn babies are girls.