题目内容：
根据下列题干，回答 题：For each blank,choose the best answer from the four choices and write down on the answer sheet.
Web browser is simply a terminal emulator,designed to display text on a screen.The two essential differences between an ordinary terminal emulator and a Web browser are that the browser knows how to deal with ?(1) ，and that it has a mechanism for ?(2) ?graphical fries.Display text，display graphics，and (3) hyperlinksthere's 99 percent of the (4) value.That's not to say that the manufacturers didn'tgo allout to attach a hyperactive efflorescence of useless capabilities onto their browsers.Remember when media channels in the browser were a big deal，instead of the clutter you can't wait to delete from your favorites of bookmarks menu?Remember when client-side Java applets were supposed to become the preferred (5) for application development?Remember frames and all their nasty side effects?
请选择（1）处最佳答案：
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