B．Touching each other.

　　C．Roaring to each other.

　　D．Showing their teeth to each other.

　　7．When a lion is scared, he will ________.

　　A．close his eyes

　　B．put down his tail

　　C．make himself look bigger

　　D．stand high with his back feet

　　8．What can we know from the last paragraph?

　　A．The lion is the loudest animal in the wild.

　　B．Loud roars can be warnings to other prides.

　　C．Members of a pride have the same language.

　　D．It's not easy for mother lions to find their children.

　　C

　　An online chatting robot named Xiaotu on the website of Tsinghua University's library

　　had to pause services during the winter vacation because too many visitors wanted to talk to it about absurd (荒谬的) matters unrelated to library services.

　　Xiaotu, which means "little library" in Chinese, has the ability to learn during its conversations with humans, but its designers said it has picked up too much "unsuitable material" from visitors to the website.

　　"It had been a long time anyway since we last cleared up its database (数据库)，so we decided to pause the service to do it，" said a design group member surnamed Yao, who works in the university's library.

　　Xiaotu's main functions include answering questions about the library, searching library collections and other search engines, and self­learning.

　　Design work on Xiaotu Started in 2009 and by the end of 2010 it was put online on the homepage (主页) of Tsinghua University's library and on www. renren. com, a social network similar to Facebook.

　　On the library's homepage, it was scoring more than 1,000 visits a day.

　　But many of the questions were not appropriate (合适的)to Xiaotu's role and it learned a lot of language from users which was unrelated to library affairs, and which was often meaningless or worse.

One user asked Xiaotu，"Who are your parents？" And it answered，"Tsinghua University and Peking University."