题目

  A nobleman and a merchant once met in an inn. For their lunch they both ordered soup. When it was brought, the nobleman took a spoonful, but the soup was so hot that he burned his mouth and tears came to his eyes, The merchant asked him why he was weeping. The nobleman was ashamed to admit (承认) that he had burned his mouth and answered, “Sir, I once had a brother who committed a great crime (犯罪), for which he was hanged. I was thinking of his death, and that made me weep.” The merchant believed this story and began to eat his soup. He too burned his mouth, so that he ha如图是人体血液循环模式图．A、B、C、D分别代表心脏的四个腔，a～f代表血管，箭头代表血液流动的方向．据图分析作答：（1）血液流经小肠时______的含量增多，这是因为小肠是______的主要场所．（2）血液流经肾脏时______的含量减少，这是因为肾脏是______的场所．（3）血液流经组织细胞后，______的含量会减少，这是因为在组织细胞处______，为生命活动提供能量．（4）临床上常给肺炎病人吸氧和点滴青霉素，其中氧气是靠血液中的______细胞运至全身的，青霉素随着血液的流动最先流人心脏的______．（5）正常人，由于______作用，使b和a内血液中葡萄糖含量基本相等．