题目

下列关于内环境的叙述，错误的是A. 血浆渗透压的大小主要取决于血浆中无机盐和蛋白质的含量B. H2CO3/NaHCO3是维持血浆pH稳定的缓冲物质C. 正常情况下，内环境的各项理化性质都处于动态平衡中D. 内环境是机体进行正常生命活动和细胞代谢的场所 答案：【答案】D【解析】渗透压大小取决于溶质颗粒数目的多少，而血浆渗透压的大小主要与蛋白质和无机盐的含量有关。血浆pH之所以能维持相对稳定是因为有缓冲物质，如H2CO3/NaHCO3和NaH2PO4/Na2HPO4等的存在；内环境稳态的实质是内环境渗透压、温度、pH等理化特性和化学成分保持动态平衡的过程；内环境又第—节:完形填空(共20小题;每小题1. 5分，满分30分)阅读下面短文，从短文后各题所给的四个选项 (A、B、C和D) 中,选出可以填入空白处的最佳选项。                        ★ ★ ★ ☆ ☆              It was my birthday. My husband and I spent the day going on some adventures,and 41 to have dinner in th£ Philadelphia,Pennsylvania area. At dinner we were 42 at a table with another gentleman and his eight-year-old son. We shared some 43 conversation through the meal and,afterwards,we parted friendly.               44 my husband and I were walking through the parking garage I heard someone calling us from the level above. I 45 to see the man and his son standing there waving us down. I went over to where I could look up and see him and he 46“do you have jumper cables (跨接引线) ?”               As it was 47 to hear him,my husband and I walked up to the second level to speak with him. 48 his car had decided that it didn t want to turn on and after 49  it'we had come to the 50  that the battery (电池) was indeed dead. didn't happen to have cables on us so we asked a few more passers-by,all of whom ignored our small group and simply 51 walking.               So,we 52 to drive him in our car to the 53 store where we could get cables. He said he didn't want to 54 us,apologizing repeatedly because he knew it was my birthday. I told him that there was no better 55  than helping out another.               We got into our car and drove to a 56 nearby. After we got the cables,we drove back to the parking garage to 57 the gentleman's car.I helped watch the boy as my husband and his father set to work,quickly bringing his car back to life. We 58 the man's offering of money and waved away his apologies as we were just 59 that he and his son would be able to get home safely and weren’t 60 in a parking garage all night.41. A. asked   B. promised   A. decided   D. managed 42. A. booked   B. seated   C. invited   D. ordered43. A. formal   B. serious   C. private   D. polite44. A. As   B. Until   C. Though   D. Since 45. A. looked out       B. looked up     C. looked forward   D. looked around46. A. greeted   B. doubted   C. shouted   D. demanded47. A. difficult   B. possible   C. interesting   D. special48. A. Simply   B. Obviously   C. Fortunately   D. Especially49. A. driving   B. opening   C. checking   D. repairing50. A. conclusion   B. result   C. solution   D. point51. A. stopped   B. avoided   C. enjoyed   D. kept52. A. pretended   B. offered   C. hoped   D. struggled53. A. largest   B. cheapest   C. best   D. closest54. A. disappoint   B. miss  C. trouble   D. change55. A. chance   B. way   C. game   D. gift56. A. restaurant   B. hotel   C. station   D. supermarket57. A. start   B. park   C. wash   D. build58. A. earned   B. refused   C. accepted   D. forgot59. A. sorry   B. afraid   C. surprised   D. happy60. A. lost   B. involved   C. stuck   D. locked