人教高中英语复习课堂练习27 ：选择性必修2 Unit 3　Times change！ Word版含解析.doc

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选择性必修第二册　Unit 3　Times change!
A组·基础巩固
Ⅰ. 语法填空
A
Technological changes brought dramatic new options to Americans 1. ________ (live) in the 1990s. During this decade new forms of entertainment, commerce, research, and communication 2. ________ (become) commonplace in the US. The driving force behind much of this change was an innovation popularly known as the Internet.
The Internet was developed during the 1970s by the Department of Defense. In the case of an attack, military advisers suggested 3. ________ advantage of being able to operate one computer from another terminal. In the early days, the Internet was used mainly by scientists to communicate with other scientists.
One early problem faced by Internet users was speed. Phone 4. ________ (line) could only transmit information at a limited rate. The development of fiber­optic (光纤) cables allowed billions of bits of information 5. ________ (receive) every minute. Companies like Intel developed faster microprocessors, so personal computers could process the incoming signals more 6. ________ (rapid)．
In the early 1990s, the World Wide Web was developed, in large part, 7. ________ commercial purposes. Corporations created home pages 8. ________ they could place text and graphics to sell products. Soon airline tickets, hotel reservations and even cars could be purchased online. Universities posted research dat