●In the following essay,each blank has four choices.Choose the most suitable one from the four choices and write down in the answer sheet.There are two types of key technology：private key and public key.Private-key encryption methods are called (66) ciphers，information is encrypted with (67) both the sender and receiver hold privately.Public-key encryption methods are called (68) ciphers， (69) created for each user，encryption key and decryption key ale (70) .

　　(66) A.synchronous

　　B.Asynchronous

　　C.symmetric

　　D.asymmetric

　　(67) A.a key

　　B.two keys

　　C.three keys

　　D.four keys

　　(68) A.synchronous

　　B.Asynchronous

　　C.symmetric

　　D.asymmetric

　　(69) A.two related keys ale

　　B.a key is

　　C.two unrelated keys ale

　　D.three keys ale

　　(70) A.same

　　B.different

　　C.difference

　　D.some

　　●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 (71) ，and that it has a mechanism for (72) graphical fries.Display text，display graphics，and (73) hyperlinks�瞭here's 99 percent of the (74) value.That's not to say that the manufacturers didn'tgo all�瞣ut 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 (75) for application development?Remember frames and all their nasty side effects?

　　(71) A.superlinks

　　B.links

　　C.hyperlinks

　　D.connections

　　(72) A.displaying

　　B.illustrating

　　C.drawing

　　D.writing

　　(73) A.direct

　　B.navigate

　　C.indicate

　　D.go-on

　　(74) A.Web browser�餾

　　B.terminal's

　　C.emulator's

　　D.network's

　　(75) A.plane

　　B.plant

　　C.plate

　　D.platform

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