在使用“成本—效益”分析法评价政府支出项目时，所使用的贴现率（社会贴现率）一般是（）

单项选择题In which way should the strangers be introduced, when they met for the first time?A、Female was introduced to male. B、Male was introduced to female. C、The inferior was introduced to the superior. D、The superior was introduced to the inferior.

单项选择题在引导幼儿感知和理解事物”量”的特征时，恰当的做法是( )。(2018下) A、引导幼儿感知常见事物的大小高矮粗细等 B、引导幼儿识别常见事物的形状 C、和幼儿一起手口一致点数物体，说出总数 D、为幼儿提供按数取物的机会