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  3. Technological changes brought dramatic new options to Americans living in the 1990s. During this decade new forms of entertainme

Technological changes brought dramatic new options to Americans living in the 1990s. During this decade new forms of entertainme

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问题     Technological changes brought dramatic new options to Americans living in the 1990s. During this decade new forms of entertainment, commerce, research, and communication became commonplace in the U. S. The driving force behind much of this change was a( n)【C1】______ 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 the【C2】______ 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. The Internet【C3】______ under government control until 1984.
    One early problem faced by Internet users was speed. Phone lines could only transmit information at a【C4】______ rate. The development of fiber-optic (光纤) cables allowed for billions of bits of information to be received every minute. Companies like Intel developed faster microprocessors, so personal computers could process the【C5】______ signals at a more rapid rate.
    In the early 1990s, the World Wide Web was developed, in large part, for【C6】______ purposes. Corporations created home pages where they could place text and graphics to sell products. Soon airline tickets, hotel【C7】______ , and even cars and homes could be purchased online. Universities【C8】______ research data on the Internet, so students could find【C9】______ information without leaving their dormitories. Companies soon discovered that work could be done at home and【C10】______ online, so a whole new class of telecommuters began to earn a living from home offices unshaven and wearing pajamas (睡衣).
A) advantage I) maintained
B) commercial J) occupations
C) conservation K) posted
D) equipped L) remained
E) incoming M) reservations
F) innovation N) submitted
G) limited O) valuable H) local
【C4】
选项
答案G
解析 形容词辨析题。本空位于冠词a和名词rate之间，因此应填入形容词修饰rate。空格所在句的前一句提到，因特网用户早期面临的一个问题是网速，也就是说早期的因特网网速很慢。本句是对前一句的进一步解释，电话线路只能以______速度传输信息。空格处应填入有“慢”含义的形容词，故答案是G)limited“有限的”。本空前冠词是a，故排除E)incoming。而除了G)limited以外的其他形容词不能修饰rate(速度)，故排除。
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