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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】________.
【C13】
选项 A、Even though
B、Now that
C、If only
D、Provided that
答案A
解析 前面的still是个很重要的提示词，意为“还是，仍是”，隐含让步转折的意思。结合前文提到郭台铭有一件事说对了：增材制造不会取代大规模制造，可知“即使”3D打印技术不断改进，某些打印物品的抛光度和耐久性还是……制造者的要求。选项中只有Even though可以表让步，故选A项。B项Now that“既然”及D项Provided that“假如”都不表示让步。C项If only表示但愿、希望，指一种强烈的愿望，后接虚拟语气。
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