单项选择题

Chinese painting creations appeared divided into official and unofficial camps. A.
公职的 B.
公务的 C.
官方的 D.
私密的

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The car of the future will drive itself， leaving people free to read the newspaper， or work during the trip.

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妊娠中期以后,羊水来源于 A.
胎儿尿液 B.
母体血液 C.
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母体血清的透析液 E.
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