A 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 files. Display text, display graphics, and （3） hyperlinks--there’s 99 percent of the （4） value. That’s not to say that the manufacturers didn’t go all-out 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
（3）是（）
A.direct
B.navigate
C.indicate
D.go-on
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