第一节：单项选择（共15小题；每小题1分，满分15分）/
21. A child brings great joy to a family. Our ancestors ____________ the birth of a child by giving away red eggs.
A. congratulated B. memorized C. honored D. celebrated
22. Teenagers don’t know much of the world yet, that’s why they are so easily ___________.
A. taken in B. taken up C. taken on D. taken off
