2. 外语
  3. The first modern digital computers were developed in the 1940s for military purposes that arose during World War II. These comp

The first modern digital computers were developed in the 1940s for military purposes that arose during World War II. These comp

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问题     The first modern digital computers were developed in the 1940s for
military purposes that arose during World War II. These computers filled
entire rooms, and with rates of a few thousand calculations per second, they【S1】______
took hours to perform complex mathematical operations. In the 1970s, the
first personal computers were sold. Fitting on a desktop, they are【S2】______
exponentially faster and more powerful than the computers that had once filled
large rooms. They were also affordable to individual consumers, made it【S3】______
possible for many people to use them for personal, business, and academic
needs. By the mid-1990s, laptop computers able of millions of calculations【S4】______
per second had been developed. Currently, nearly half of the American homes
have a personal computer, and businesses have come to rely on computers for
nearly every function.
    Now that computers are small, powerful, cheap, and effect every part of【S5】______
our lives, the next step will be the formation of a network connecting all of
these computers to each another. On this network, which some people are【S6】______
calling the information highway, great changes take place every day. The
changes to society will be as revolutionary as those of the Industrial Age and
the Renaissance. Not only will people shop and conduct business through their
computers, but they will also engage with every type of human activity, from【S7】______
reading to simply hanging with friends. The increased level of communication【S8】______
made it possible by computer networks will bring many benefits in the areas of【S9】______
business, education, and social interaction, producing widespread sharing of
knowledge and wealth and the worldwide cultural renewal.【S10】______
【S9】
选项
答案it一去掉it
解析 代词冗余。该句结构为The increased level of communication被made possible修饰，made possible为过去分词短语作后置定语，不需要代词it，故将it去掉。
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