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  3. Peek through the inspection windows of the nearly 100 three-dimensional (3D) printers quietly making things at RedEye, a company

Peek through the inspection windows of the nearly 100 three-dimensional (3D) printers quietly making things at RedEye, a company

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问题     Peek through the inspection windows of the nearly 100 three-dimensional (3D) printers quietly making things at RedEye, a company based in Minnesota, and you can catch a glimpse of how factories will work in the future. It is not simply that the machines run day and night【C1】________by just a handful of technicians.【C2】________it is what they are making that shows how this revolutionary production process is【C3】________the manufacturing mainstream.
    3D printers make things by building them up, a layer at a time,【C4】________a particular material, rather than【C5】________it by cutting, drilling or machining—which is why the process is also called additive manufacturing. There are many ways in which this can be done, and with only a【C6】________adjustment of software each item can be different,【C7】________the need for costly retooling of machines. This has made 3D printing a【C8】________ way to make one-off items, especially prototype parts, mock-ups, small mechanical【C9】________and craft items.
    And that is about all that 3D printers are good for,【C10】________the doubters. Chief among them is Terry Gou, the boss of Foxconn. He thinks 3D printing is just "a trick" without any【C11】________value in the manufacture of real finished goods, and he has vowed to start spelling his name backwards if【C12】________wrong.
    Mr. Gou is right about one thing: additive manufacturing is not about to replace mass manufacturing.【C13】________the technology is improving, the finish and durability of some printed items can still【C14】________ what producers require. And nor can 3D printers produce millions of【C15】________parts at low cost, as mass-production lines can.【C16】________3D printers have their【C17】________which is why they are starting to be used by some of the world’s biggest manufacturers, such as Airbus, Boeing, GE, Ford and Siemens.
    The market for 3D printers and【C18】________is small, but growing fast. Last year it was worth $2.2 billion worldwide, up 29％ from 2011. As producers become more【C19】________with the technology, they are moving from prototypes to final【C20】________.
【C3】
选项 A、entering
B、conveying
C、importing
D、consuming
答案A
解析 revolutionary(革命性的，创新的)表明3D技术是新兴技术，只能是逐渐融入manufacturing mainstream(制造业主流)，故选A项entering“进入，汇入”。B项conveying、C项importing、D项consuming代入原文后，分别表示“传达制造业主流”、“进口制造业主流”、“消耗制造业主流”，语义上都不通顺。
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