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Shanghai has been the world-famous business centre since century .
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在①Cu、Mg、S、Hg ②CO2、CuO、P2O5、H2O ③H2、O2、N2、C三组物质中,均有一种物质与组内其它物质存在明显的不同,这三种物质分别是 [ ]
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用be的三种形式填空。 1. I ______ an English girl.
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There is a(an) ______ that more graduates choose teaching as their permanent careers.
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He knows so much about Russia that he's universally acknowledged as a(n) _____ on Russian affairs.
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