《上古天真论》“肾气平均，筋骨劲强，真牙生而长极”见于（）
A.女子三七
B.男子四八
C.男子三八
D.女子四七
E.男子五八
参考答案：C
When about one of the biggest problems today, many experts say that an energy crisis is approaching and is thus threatening mankind's survival．
A．asked
B．being asked
C．having asked
D．asking
通过一定的榜样来强化相应的学习行为或学习行为倾向，称为______________。
