单项选择题

Hello，may I speak to John？ ——（）

A.Yes，this is John speaking
B.Yes，I’m John
C.Yes，that’s right
D.Yes，speak，please

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Before the Carolingian renaissance，cultural and educational standards in Western Europe had already surpassed those of the Byzantine Empire or Muslim world。（）

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The characteristic features of the Gothic style.included pointed arches，ribbed vaults，flying buttresses，thinner walls，large and stained－glass windows。（）