问题
单项选择题 A1型题
肾性骨营养不良症，简称肾性骨病，病因最主要是（）。
A.继发性甲旁亢
B.维生素B缺乏
C.甲状腺功能低下
D.铝中毒
E.代谢性碱中毒
答案
参考答案：A
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肾性骨营养不良症，简称肾性骨病，病因最主要是（）。
A.继发性甲旁亢
B.维生素B缺乏
C.甲状腺功能低下
D.铝中毒
E.代谢性碱中毒
参考答案：A
Passage One
Concerning one’s sitting posture, which of the following is correct
A．One should prop his head with his elbows on the table.
B．One should hold an extra napkin.
C．One should be upright in his chair.
D．One should lean against the back of his chair.