“构成中国的内聚性的又一重要因素是存在着一种可追溯到数千年前、最古老的商朝的书面语”，其中“商朝的书面语”具体指（   ）

    Today is the last Saturday before Christmas. Everyone in the USA 1 shopping for presents. 2 is falling. People are walking fast. They are trying to keep3 when they move from shop to shop. In the shops children are 4 at the toys. They are talking to a man called Father Christmas. He asks, "What do you want for Christmas?"

    In the USA it is warm and beautiful in summer. The trees and fields are green then. But now it is winter and 5is white.

    At 6, small lights make the houses and buildings 7. Christmas is a beautiful 8 of a year.

    Christmas Day always begins before 9. Children wake up very early in the morning. They open the 10from their parents. Then they wake up their parents, saying "Merry Christmas."

如图为人体某一部位的血液循环示意图，C代表某器官处的毛细血管网，请回答：

（1）若C表示人体肺部毛细血管网，则B代表的血管是____ ；流经C后，血液发生的变化是____ 

（2）如果流经C后，血液中的营养物质明显增加，这时C代表____ 处的毛细血管．

（3）如果C代表肾脏，当血液流经每一个肾单位时，经过____ 作用和肾小管的重吸收作用形成尿．

（4）饭后如果血液流经C后，血液中的葡萄糖明显减少，则C代表____ 处的毛细血管．

（5）一位同学外出旅游时不慎被蛇咬伤，咬伤部位在手臂的C处，为防止蛇毒随血液经心脏扩散到全身，紧急处理时，应该用止血带扎住伤口的____ 　（填“m”或“n”）端．