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阅读下面的文字，完成文后各题。 网络并不完美 余建斌 今年是中国全功能接入互联网20周年，从互联网进入人们工作和生活的普及程度看，全球互联网也就走过二三十年。互联网从最初的工具、渠道、平台的属性，变成了一个复杂的网络空间。这样一种态势被人认同：“当前，互联网正以势不可挡的力量，掀起一场深刻影响人类社会的伟大变革。” 作为后来者的中国互联网，其地位和角色的重要性在世界范围内越来越凸显，按市值估算的阿里巴巴已Teachers say the digital age has had a good and a not-so-good influence on the American teenagers. More than 2,000 high school teachers took an online survey.75 percent of the teachers said the Internet and digital search tools have had a “mostly good” use for their students' research habits and skills, But 87 percent agreed that these technologies "make the students not have enough attention.” And 64 percent said the technologies “do little to help them in courses.”Judy Buchanan is a director of the National Writing Project. Ms. Buchanan says digital research tools are helping students learn more, and learn faster. Teachers really like these tools, because they are ways to make some of learning exciting. Young people enjoy using these tools. And the goal is to help them become creative students of meaningful work, and not just that kind of copyist.But one problem the survey found is that many students don't have a good understanding of how to use the digital knowledge well. In other words, they trust(信任) too much of the information. Judy Buchanan says these students have not developed the skills they need to tell whether the online information is good or bad.Another problem the survey found is something that might not seem like a problem, at all, being-able to quickly find information online. Teachers say the ability of their students to work hard to find answers is becoming weaker. They say students depend too much on search engines (引擎) and do not make enough use, of printed books or research, librarians.Besides, many teachers are also worried about the problem that the Internet makes it easy for students to copy work done by others, instead of using their own abilities.小题1:      of the teachers agreed technologies may stop students from having enough attention.A．50%B．64%C．75%D．87%小题2: How many problems are mentioned (提及) in the passage'?A．OneB．Two.C．Three.D．Four.小题3:Teachers like the digital search tools because they can        .A．make some of learning excitingB．help students find answers easilyC．tell whether the information is good or notD．help students copy the work done by others小题4:What does the writer want to tell us by writing this passage?A．Digital search tools have quite a lot of advantages.B．Students don't know how to use the digital search tools.C．Many teachers are worried about the students' abilities.D．Students should learn how to use the digital tools in a right way.