题目内容：
阅读下列短文，回答题。 Recently, more than 2,000 high school teachers have been asked about the effect of the Interneton their students． Teachers say the Internet has had a good influence(影响and a not-so-good influence on this generation．
Three quarters of the teachers say the Internet and search tools have had a great effect on theirstudents'research habits and skills． But 87 percent agree that this young generation don' t knowabout hard work and can't stay attentive(注意力集中的) for long． And 64 percent say the Internetdoes more to distract (使分心)students than to help them in their studies． Many students think "doingresearch"just means doing a quick search on Google．
According to the teachers, one problem is that students trust too much of the information on theInternet． These students have not developed skills to judge the quality of the information． It' s some-thing that really has to be taught and paid attention to． It' s like everything else． In a world wherethings can happen quickly, you really need to have a way to step back, think and make judgmentabout the information you have． And teachers can do a lot to teach that．
Another problem is that being able to quickly find information keeps the students from workinghard． They become dependent on search tools and do not make enough use of printed books． Manyteachers are also afraid that the Internet makes it easy for students to copy work done by others．
What does the text mainly discuss about the Internet? A．Its success in high school teaching．
B．Its influence on school teachers．
C．Its achievements in school research．
D．Its effect on high school students．
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