题目

What affects our self-esteem（自尊）? Puberty（青春期）and development. Some people struggle with their self-esteem and body image when they begin puberty.  36  These changes, combined with wanting to feel accepted by our friends, mean it can make us want to compare ourselves with others. The trouble with that is, not everyone grows or develops at the same time or in the same way. Media images and other outside influences. Our early teens are a time when we become more aware of celebrities (名人) and media images as well as how other kids look and how we fit in with others.�如图，已知：∠MON=30 °，点A1、A2 、A3…在射线ON上，点B1、B2、B3…在射线OM 上，△A1B1A2、△A2B2A3 、△A3B3A4 …均为等边三角形，若OA1=1 ，则△A6B6A7的边长为（ ）A．6 B．12 C．32 D．64