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【单选题】
引起低钙血症的原因很多，包括PTH缺乏、维生素D缺乏、低白蛋白血症等，判断低钙血症需要掌握患者的代谢情况。肾病综合征引起低钙血症的原因是（）A.
PTH缺乏
B.
维生素D缺乏
C.
慢性肾功能减退
D.
低白蛋白血症
E.
血症
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【单选题】听力原文： Today I am going to talk about the differences between British English and American English. To begin with, some of the spelling of the British English are really different. Words like theater a...
A.
Certer.
B.
Center.
C.
Centr.
D.
Centere.
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