A. About 5 percent.

　　B. About 20 percent.

　　C. About 10 percent.

　　D. About 23 percent.

　　30. B 细节理解题。根据最后一段第一句根据文章最后一段的At the same time, however, a questionnaire completed by 4,427 suggests that 20 percent of parents believe their children’s education is affected by surfing the Net。可知大约百分之20的人认为上网会影响孩子的教育。故B正确。

　　31. In the following paragraph, the author will probably discuss ________.

　　A. how much time children spend on the Internet

　　B. how children learn about the world through the Net

　　C. how parents feel about their children’s studies

　　D. how children make use of the Internet to study

　　31. A 推理判断题。本文最后一句They think their children are doing poorly at the school due to the amount of time they spend on non-educational websites.人们认为孩子在学校表现不好主要是因为他们花在与学习无关的网站上的时间太多了。那么接下来文章最可能讨论的是孩子们究竟在这些网站上花了多少时间。故A正确。

　　D

　　Some people are like homing pigeons: Drop them off anywhere, and they’ll find their way around. Other people, though, can’t tell when they’re holding a map upside down. Are the directionally challenged just bad learners?

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