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{{B}}A Wonderful
Chip{{/B}} It is tiny, only about a quarter of an inch square, and quite flat. Under a microscope, it resembles a stylized Navaho rug or the aerial view of a railroad{{U}} (51) {{/U}}yard. Like the{{U}} (52) {{/U}}of sand on a beach, it is made mostly of silicon,{{U}} (53) {{/U}}oxygen, the most abundant element on the surface of the earth. Yet this inert fleck (小片), still unfamiliar to the{{U}} (54) {{/U}}majority of Americans, has astonishing power. It is cheap to{{U}} (55) {{/U}}produce, fast, infinitely versatile and convenient. The miracle chip represents a quantum(重大的){{U}} (56) {{/U}}in the technology of mankind, a development that{{U}} (57) {{/U}}the past few years has acquired the fo A. before B. over C. after D. since 更多"阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的"的相关试题: [单项选择] 阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案。
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