一桶汽油，用去一半后，会发生改变的是：[ ]
A．密度
B．比热容
C．质量
D．热值
C
She ________ her sister in appearance but not in character.[ ]
A. looks
B. compares
C. resembles
D. equals
尿后余沥不尽的病因是（）
A.肾精亏虚
B.肾阴亏虚
C.肾气不固
D.膀胱湿热
E.肾虚水泛
