A. 请阅读下面材料: 企业在几种报纸、杂志上做广告时,在广告下面附有一张表格或条子,请读者阅后剪下F 分别寄回企业有关部门,企业从回收的表格中可以了解在哪种报纸杂志上刊登广告最为有效,为今后选择广告媒介和测定广告效果提出可靠资料。该材料反映的是什么收集方法? B. 直接观察法 C. 实际痕迹测量 D. .邮寄
【简答题】Thus, the concept of receptor implies that the same molecule that has the binding or recognition site can participate normally in the initiating in cell activation.
【简答题】翻译: Thus, the anthropological concept of “culture,” like the concept of “set” in mathematics, is an abstract concept which makes possible immense amounts of concrete research and understanding.