My name is Tom. I come from England. I like to have friends who are different from me. My best friend is Paul. Paul is funnier, more outgoing and athletic than me. He always tells jokes and makes me laugh. We also like different things. He likes going to the movies. He likes playing sports. He likes pop music. But I like reading books. He often asks me to go to the movies and gives me some interesting books. And I often give him CDs. We often help each other.

黄土高原地区主要的自然灾害（　　）

一个善良的背影，汇入茫茫人海。他用中国人熟悉的两个字，掩盖半生的秘密。张纪清，27年署名“炎黄”捐款，建敬老院、希望小学。27年间，江阴人一直在寻找“炎黄”这位好心人，当地甚至还建设了一个“炎黄陈列馆”。张纪清的事迹说明（  ）

①在奉献社会中实现了人生价值 ②自我价值实现要有良好社会环境

③在帮助他人的同时肯定了自我 ④在帮助他人的同时否定了自我

读下图，回答下列问题。