Li Qiu is a boy of fifteen and studying in Grade Three at Oak school. His family lives outside the town. His parents have a farm and grow a lot of vegetables on it and they often sell them in the town. These years they've built a new building and bought a tractor, a motorbike，a color television，a fridge and other things. Two years ago，Li Qiu began to study in a middle school. He does well in all his lessons and now he's becoming more and more interested in science. He likes to try out new ideas and hopes to be an inventor. This term he's learned electricity (电学). He always watches TV carefully. Last Saturday，when he came back home，his parents were working in the fields. He looked at the new color TV for a while. Then he began to take apart (拆) it. Three hours later his mother came in and saw him fixing the TV set. She was surprised and asked，"What are you doing here，Li Qiu?" "I took apart the TV just now." "Don't worry about it，Mummy," said the boy "I only want to know how it works." "Have you refixed it together?" asked Mum. "No，Mum，" the boy said in a hurry. "Look，there are some parts left. I don't know where to put them."

In fact，__________.

A.Li Qiu has learned a lot of electricity

B.Li Qiu has been good at refixing TVs

C.Li Qiu has broken their TV down

D.Li Qiu has known how the TV works