In 1948, three American scientists invented ____ transistor, which is ____ small
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In 1948, three American scientists invented ____ transistor, which is ____ small electronic device to control an electric current.| A．the; a | B．a; a | C．the; the | D．a; the |
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答案
| A |
解析
试题分析：考查冠词：发明物的单数名词前用定冠词，由此可排除B、D。后面一空用不定冠词，表示“一种(小设备)”。句意：1948年，三位美国科学家发明了晶体管——一种能控制电流的小型电子器件选A。
点评：对于冠词，要注意不定冠词表示泛指，定冠词表示特指。还有不加冠词的时候。 |
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