含有组胺和过敏性反应物质的是（）
A.中性粒细胞
B.嗜酸性粒细胞
C.嗜碱性粒细胞
D.血小板
E.红细胞
参考答案：C
解析：可塑变形性是指正常红细胞在外力作用下发生变形的能力；中性粒细胞和单核细胞具有吞噬细菌、清除异物、衰老红细胞和抗原抗体复合物的作用；嗜碱性粒细胞释放的肝素具有抗凝作用；血小板有助于维持血管壁的完整性，血小板数量明显降低时，毛细血管脆性增高；嗜碱性粒细胞颗粒内含有组胺和过敏性慢反应物质，可使毛细血管壁通透性增加，局部充血水肿，并可使支气管平滑肌收缩，从而引起荨麻疹、哮喘等变态反应。
John and Henry studied in the same school. John lived in fear of Henry — every day he gave his lunch money to Henry, but Henry still beat (揍) him up. He said that if John told anyone he would beat him up in front of all the other kids in his class. John had to ask his mom for more and more lunch money, but he seemed 1 than ever and came home from school hungry every day. John even cried one day, and a girl told everyone that he was just like a baby and had cried. John was 2 and felt so bad about himself and about school. One day, John met Jimmy, a boy 3 also had to give his lunch money to Henry. John told Jimmy how he 4 bullying (欺侮), and found that Jimmy felt the same. They finally thought of a good way of dealing with their 5 . The following day, Henry came to John to ask him for his lunch money. “I don’t want to give my money to you,” said John. “What?” Henry shouted. John said 6 , “I want to have my lunch today, and you, get away (滚开)!” “You want to get beaten up?!” Just then Henry’s fist (拳头) was hitting John’s face, they heard 7 shout, “Stop!” Henry was very angry to hear that. He turned around 8 found that his teacher Ms Brown was standing just behind him. He felt very surprised. Jimmy had taken Ms. Brown to John’s class and she 9 the bullying with her own eyes. Henry was taken to the head teacher’s office. 10 that, he never bullied others again. John and Jimmy helped not only themselves but Henry and other kids.
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