下列不属于社会性需要的是（）。
A.求知欲
B.交往
C.饥饿
D.威信
参考答案：C
常用的体积单位有______、______、______．
Many of the electric and electronic products we purchase and consume today are what some industrial experts call " homogeneous toys".
A．identical
B．homosexual
C．unrelated
D．distinguishable
