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        1. The computer is ______useful tool in _______world today.
          A.a(chǎn)n; theB.a(chǎn); theC.the; theD.a(chǎn); a
          B

          試題分析:句意:今天電腦是世界上一種有用的工具。不定冠詞a/an表示某一類人或某事物中的任何一個,經(jīng)常用在第一次提到某人或某物時,用不定冠詞起介紹作用,表示一個。a用于輔音音素前an用于元音因素前。useful,輔音音素開頭,in the world,在世界上,故選B。
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