2. 外语
  3. Although 【21】______ circuits made computers smaller, the processing units still consisted 【22】______ a number of circuits

Although 【21】______ circuits made computers smaller, the processing units still consisted 【22】______ a number of circuits

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问题       Although  【21】______   circuits made computers smaller, the processing units still consisted  【22】______   a number of circuits on separate chips. In 1971, an engineer working for Intel realized that a  【23】______   of circuits commissioned for an electronic calculator could all be put  【24】______   one chip, and that the resulting device could be used  【25】______   a general-purpose "computer on a chip". The result was the Intel 4004 -- the world’s first microprocessor. Physically, it consisted of a silicon chip in a protective ceramic capsule, with a set of metal pins sticking  【26】______   that connected it to other components in whatever  【27】______   it controlled. It  【28】______   2,300 transistors,  【29】______   60,000 operations per second, and could be used for any device -- including computers and robots -- that required a "brain" for accepting  【30】______   and following a program of  【31】______   to produce an output. Within five years, many very powerful microprocessors had  【32】______   .The invention of microprocessors  【33】______   the stage for the arrival of the microcomputer, or personal computer (PC)-- an affordable machine for  【34】______   The first PCs, in kit form, appeared in the mid 1970s, and by the mid-1980s machines such as the Apple Macintosh and those based  【35】______   a PC first  【36】______   by IBM in 1981 were popular throughout the world. The success of these machines led to an explosion of software, in  【37】______   a range of spreadsheet, word-processing, graphic, educational, and games programs. Since the 1980s, a number of strong-intertwined themes have  【38】______   the computer revolution forward, including a continuing increase in the processing power and decrease in the size and cost of PCs; a switch of emphasis from  【39】______   to linked machines, as evidenced by the growth of local area networks and the Internet; and the spread of computer applications into virtually every  【40】______   of home and business life.
【32】
选项 A、happened
B、occurred
C、appeared
D、shown
答案C
解析 happen和occure都指事件的“发生”；appear意为“出现”；show之后不加宾语时，意为“看得见，可察觉出”。此处与“微处理器”搭配，并非一个事件，故排除A、B。D与上下文要求不符。因此C为正确答案。
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