完形填空:阅读下面短文,从各题所给选项中选出最佳答案。Dear Diary, Today we had an English class about robots. Our teacher showed us some pictures of robots that can do housework. He said scientists are making robots that can help people in many ways. Some robots can clean the rooms, some can cook food, and some can talk with us. I think robots are useful, but I don't think they can take the place of human teachers. They can never understand us as deeply as humans.