作为系统的边界，细胞膜在细胞的生活动中有多种功能。下图的模型

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问题选择题

作为系统的边界，细胞膜在细胞的生活动中有多种功能。下图的模型主要表明了细胞膜的何种功能？

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A．将细胞与外界环境分开

B．控制物质进出细胞

C．进行细胞间信息交流

D．维持细胞内环境的稳定

答案

答案：C

选择题

. It is important to know exactly the message ________ and ________.

A．you want to send it to people; that you try to get them to do

B．sent to people; what do they want to do

C．you want to send; which you want people to know

D．you want to send to people; what you are trying to get them to do

填空题

学生性格差异主要是指性格的特征差异和性格的().