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  3. Since 1950s, the computer industry has ______. The main idea of this passage is ______.

Since 1950s, the computer industry has ______. The main idea of this passage is ______.

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问题 Since 1950s, the computer industry has ______.
The main idea of this passage is ______.
选项 A、the role of computers in business
B、tomorrow’s promises of computers
C、the wrong prediction of computers
D、the basic knowledge of operating computers
答案A
解析 主旨题。纵观全文每段第一句话，可以看出全文主要论述了计算机在商业上的用途，故A符合题意。
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