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  3. When you think of the Internet, you probably think of ".com." Just what do those three letters at the end of a World Wide Web ad

When you think of the Internet, you probably think of ".com." Just what do those three letters at the end of a World Wide Web ad

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问题 When you think of the Internet, you probably think of ".com." Just what do those three letters at the end of a World Wide Web address mean? Every computer that hosts data on the Internet has a  1.______ numerical address. For example, the numerical address for the White House is 198.137.240.100. But since  2._____  people want to remember long strings of numbers, the  3.______ was developed. It is a critical part of the Internet’s technical infrastructure, correlates a numerical address to a word. To  4._____  the White House website, you could type its numerical address into the address box of your web browser. But most people prefer to use "www.whitehouse.gov." In this case，the domain name is  5.______ .
5._____
A．www.
B．www.whitehouse
C．www.whitehouse.gov
D．whitehouse.gov
选项 A、 
B、 
C、 
D、 
答案D
解析
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