我猜一下，

来源: 于 2018-04-08 18:37:45 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

If you google k-12 classroom, the first url is "http://www.k12.com/"

If you enter http://www.k12.com/  into the link, you will find that this web address is OK. It is not clocked by China.