Close Reading Questions 1 to 5 are based on the following passage. Aug. 4 started out as a normal workday. By noon it was pure chaos. The Blaster computer virus had taken down corporate computer networks across the country. However, for all the disruption on corporate network, businesses are generally much better protected than home users. And with high-speed Internet access linking millions of users, home computers are more vulnerable than ever. When dealing with viruses, there is no substitute for knowing what to watch out for and how to keep your computer current. A virus is simply any piece of computer code that automatically replicates itself. The vast majority of dangerous content comes as e-mail attachment. They can also come through contact with Web pages. Unfortunately, staying safe from computer viruses is now largely a reactive process. Software companies such as Microsoft fix security holes after they discover them, and distribute the fixes, usually within hours. For antivirus software to do any good, it has to have up-to-date virus definitions, which means you have to pay for the software and a subscription to keep receiving the latest list of viruses. A disk borrowed from your uncle or grandson probably won’t help. To help thwart invading worms, you need to keep your computer’s operating system current with patches, which rewrite sections of software to guard the key “kernel” code that controls the data on your hard drive. Using a firewall can keep hackers out of your machine because most firewalls can be customized to allow types of traffic that you wish to accept. After that, the antivirus software takes over the protection. Turning off your computer of disconnecting from the Internet will minimize your exposure to viruses, hackers and worms. DSL service requires you to connect before you surf; cable modems don’t. The best way to avoid viruses is to avoid questionable content. 1.“Vulnerable”(in Para. 1) means__________. A. voluntary B. defenseless C. independent D. protected