单选题

　　[阅读理解]We find that bright children are rarely held back by mixed-ability teaching. On the contrary， both their knowledge and experience are enriched. We feel that there are many disadvantages in streaming pupils. It does not take into account the fact that children develop at different rates. It can have a bad effect on both the bright and the not-so-bright child. After all， it can be quite discouraging to be at the bottom of the top grade！

　　The author‘s attitude towards “mixed-ability teaching” is ______.

　　A、critical

　　B、questioning

　　C、approving

　　D、objective