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  3. Charles Steinmets, at the age of twenty - seven, was already famous as an electrical genius and was becoming known as a warm - h

Charles Steinmets, at the age of twenty - seven, was already famous as an electrical genius and was becoming known as a warm - h

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问题     Charles Steinmets, at the age of twenty - seven, was already famous as an electrical genius and was becoming known as a warm - hearted, unusual character. One bitter winter day, an electrical engineer entered Charles’ small laboratory to discuss a problem. He found the youthful scientist working in an overcoat, fur cap and boots, his hands blue with cold. The engineer could not resist asking Charles why he hadn’t built a fire. Charles replied that a mouse had babies in his stove and they were not old enough to move.
    Born in Germany over a century ago, Charles specialized in mathematics, chemistry, and electrical engineering. In 1889 he emigrated to the United States and found work in a factory located in Yonkers, New York. Although he was offered an important job by the General Electric Company he decided not to accept it. Soon however, the General Electric Company purchased the company in Yonkers where Charles worked. He then moved to Schenectady, New York, and continued his experiments. Out of his laboratory came many experimental discoveries and over two hundred patents. A-round that time electricity was used only as direct currents, flowing in one direction. It could not be sent more than several miles from the generator that supplied the power. The experiments that Charles conducted helped the electrical industry move forward in giant strides. One of his major contributions was the simplification of alternating current. In addition to his books on the theory of alternating current , he was also known for studies of lighting.
The passage refers to "direct current" , what does it mean in this story?
选项 A、the flow of an electrical charge
B、a small factory
C、an electrical cord
D、something that is happening right now
答案A
解析 语义题。本题问文章提到了“direct current”，在这篇故事里它是何意。文中提到“……electricity was used only as direct currents(……电还仅作为直流电在使用"时，紧接着就给出了其后置定语：flowing in one direction(朝着一个方向流动)，这就可以看出“directcurrent”应该是“单向直流电”的意思。据此应该选A。the flow of an electric charge(电荷的流动)。其它选项：B．一家小工厂。C．一根电线。D．此刻正在发生的某件事。
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