题目

     Different countries and different people have different manners. We must find out their customs, so that they will not think us ill-mannered. Here are some examples of the things that a well-mannered person does or does not do.    If you visit a Chinese family you should knock at the door first. When the door opens, you'll not move before the host says “Come in, please!”. After you enter the room, you wouldn’t sit down until the host asks you to take a seat. When a cup of tea is put on a tea-table before you or sent to your hand, you’ll say “Thank you” and receive图为物质出入细胞某结构的示意图，请据图回答：（1）科学家将人的成熟红细胞放进蒸馏水中，造成红细胞破裂出现溶血现象，再将溶出细胞外的物质冲洗掉，剩下的结构在生物学上称为“血影”，“血影”的主要成分是A和B，则A代表_________________分子，它在物质运输等过程中有重要作用；该结构的基本支架是_____________（用字母表示），构成膜的A和B绝大数是可以运动的，所以膜具有___________________。（2）可能代表氧气转运方式的是图中[ ]____________；d所示物质跨膜运输的方式是_____________，钾离子进入红细胞的过程是图中[ ]______________。（3）D是____________，具有____________________________的作用。