题目

血管紧张素Ⅱ受体是一种膜蛋白。当血液中的血管紧张素Ⅱ与该受体结合时，可激活细胞内的第二信使Ca2+等，进而调节细胞的代谢活动，例如使血管壁平滑肌收缩，导致血压升高。这所体现的细胞膜的功能是（ ）A. 分隔细胞与环境 B. 信息交流C. 控制物质的进出 D. 具有流动性 答案：【答案】B【解析】血液中的血管紧张素Ⅱ与细胞膜上的血管紧张素Ⅱ受体特异性结合，可激活细胞内的第二信使Ca2+等，进而调节细胞的代谢活动，例如使血管壁平滑肌收缩，导致血压升高，说明细胞膜具有信息交流的功能，所以选B。假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。增加：在缺词处加一个漏字符号()，并在其下面写出该加的词。删除：把多余的词用斜线(＼)划掉。修改：在错的词下划一横线，并在该词下面写出修改后的词。注意：1. 每处错误及其修改均仅限一词；2.只允许修改10处，多者（从第11处起）不计分。Dear Mr. Zhang,Known that our school is going to set up elective (选修的) English courses, I'd like to give some advices. English Visual-Audio-Oral Course is a good choice. Most of us are interested at English videos and songs, that provide us with great images and beautiful music to listen to. As result, we can enjoy some local customs and singing English songs with joy. In addition, we need to improve our oral English. When we are always learning English, we may not be able to make a fluent speech. We can't easy communicate with others like native speakers. That is why I suggested taking a Speech Course. I'll be glad that if you can consider my suggestions.YoursLi Hua