填空题
A—internet resources B—at the request of the insured C—image transmission D—low resolution level E—commercial transitions F—retail network G—locate all the key parts H—the intemet service providers I—cable company J—firewire K—a public company L—seven program M—lock the protection switch N—updated version O—application software P—network traffic Q—total amount insured R—slide the switch to unlocked position
（）商业交易（）因特网服务提供者
E,H
单项选择题 The best heading for the passage is（）
单项选择题 Which of the following could probably be the title of the passage（）
填空题 49（）
