单词：circular thin-layer chromatography
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Unit 4 Free-time Activities Ice Fishing(E) A boy wanted to go ice fishing,He'd read many books on the subjectand finally,after getting all the necessary tools togetherhe made for the nearest frozen lakeAfter positioning his stool,he used a drill to m
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city 城市 cigar 雪茄 cigarette 香烟 circle 圆圈 circular 圆形的
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I first heard about the ozone layer about twenty years ago. I was still in school. I thought it was interesting, but I didnt take it seriously. It was a bit like science fiction, I mean, how could there be a giant hole in the atmosphere? Over the yea
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BEIJING, March 14 (Xinhua) -- China will change three members of the central bank's monetary policy committee, according to a circular released Wednesday by the State Council, or the Cabinet. The circular said the State Council has approved the appoi
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