腰膝酸软，小便频数而清，尿后余沥不尽，舌淡脉弱。应诊为
A．肾阳虚
B．肾气不固
C．肾精亏
D．肾阴虚
E．肝肾阴亏
参考答案：B
某气体中只含C、O元素，而且C、O质量比为3：5，则该气体成分是______或______或______．
— Where _____ my pen and books?
— _____ under your desk. [ ]
A. is; It's
B. is; They're
C. are ; It's
D. are ; They're
