Mr and Mrs Brown are from America. They are now teaching English in Beijing .Their son Jack is with them. Jack speaks English. They want him to learn some Chinese. Jack is in Grade Three in a Chinese school .He likes to play with  Chinese children every day. He listens to Chinese, speaks Chinese, reads books in Chinese and writes in Chinese. He is good at his Chinese. What is Jack's job ?
A teacher. A student. A worker. A doctor