Can you imagine a classroom without one thing that has long been considered a necessary part? No notebooks, no textbooks, no test papers. Nor are there any pencils or pens, which always seem to run out of ink at the critical moment.
   A “Paperless classroom” is what more and more schools are trying to realize. Students don't do any handwriting in this class. Instead, they use hand-sized or specially-designed computers. The teacher downloads texts from Internet libraries and sends them to every student's personal computer.
   Having computers also means that students can use the Web. They can look up information on any subject they’re studying, from maths to social science.
   A high school teacher, Judy Herrel in Florida, US, described how her class used the Web. “Using a book that’s three or four years old is impossible,” she said.
   A paperless classroom is a big step towards reducing the waste of paper.“Think about the money and trees we could save with the computers,” she said.
   But, with all this technology, there's always a risk that the machines will break down. So, in case of a power failure or a technical problem, paper textbooks should still be widely available (可得到的) for these students.

阅读下面材料，回答问题。

在微博上引爆的一只38元的青岛大虾一举成为“明星”引发全民关注。其实除了天价虾，我们还有天价蟹、天价鱼、天价鸡、天价烤串、天价毛豆……

有记者盘点了过去几年闻名海内外的十大宰客事件没有最狠只有更狠！

岑参《白雪歌送武判官归京》中辕门外送别情景之句是：____，____。

   晏子之晋，至中牟①，睹弊冠、反裘、负刍②、息于途侧者，以为君子也。使人问焉，曰：“子何为者也？”对曰：“我越石③父也。”晏子曰：“何为而至此？”曰：“吾为人臣仆三年矣。”曰：“可得赎乎？”对曰：“可。”遂解左骖④以赎之，载而与归。至舍，不辞而入。越石父怒而请绝。晏子使人应之曰：“婴未尝得交夫子也。今免子于患，吾于子犹未可耶？子何绝我之暴⑤也！”越石父曰：“吾闻士诎⑥乎不知己，而信⑦乎知己者。吾三年为臣仆，而莫吾知也；今子赎我，吾以子为知我矣。向者子乘，不我辞也，吾以子为忘。今又不辞而入，是与臣仆我者同矣。我犹且为臣仆，请鬻⑧于世。”晏子出，请见，曰：“向者见客之容，今也见客之意。婴闻之，省行⑨者不引其过，察实者不讥其辞，婴可以辞⑩而无弃乎？”越石父曰：“夫子礼之，敢不敬从？”晏子遂以为上客。

（《晏子春秋•内篇第五》）

【注】①中牟：地名，在今河南。②刍：柴草。③越石：地名。④骖：指驾在车两旁的马。⑤暴：猛、急。⑥诎：通“屈”，屈服。⑦信：通“伸”，伸展。⑧鬻（yù）：卖。⑨行：德行。⑩辞：谢罪、道歉。

本文通过对话表现人物性格，颇为传神。请分别概括晏子和越石父的性格特点。