“肾主纳气”指的是（）
A.摄纳肺吸入的清气
B.固摄肾中的元气
C.固摄体内的精气
D.摄纳生成元气
E.摄纳后天的水谷精气
参考答案：A
They went on well at first but eventually everything ______ they had worried about happened．
A．which
B．what
C．that
D．When
根据物权的成立原因，物权可分为( )。
A．意定物权与法定物权
B．用益物权与担保物权
C．动产物权与不动产物权
D．主物权与从物权
