等腰三角形的两内角度数之比是1：2，则顶角度数为（ ）

列竖式计算。

①1.2+13.6=   

②7.6-5.8=    

③5.5+2=

阅读理解

    He was struggling (费劲) to tie his shoes. I was struggling with whether I should help him. I did, and he was thankful.

   “Thank you”, he said.

  “I'm glad I could help. I just thought it would be easier for me to reach.” I said.

    He was a disabled man, and had to look down most of the time. His arms and legs were twisted (扭曲的) terribly, and he couldn't do what the rest of us would consider easy tasks. He always managed to look up to see how you respond to his words, however. He had a big smile, making me feel comfortable.

    I was still on my knees by his wheelchair.

   “Nice shoes,” he said.

  “Thanks. No one ever complimented me on them before,” I said.

  “No one has the same view of the world as I do,” he replied.

  “Tell me about the world as you see it,” I said smiling.

  “Most people can see if someone is comfortable with them or not in their eyes. I see it in their feet,” he said. “If people keep moving their feet, I just let them go, because I know they're not patient with me. I don't want to make people uncomfortable.”

   “What about me?” I asked.

   “I could see your compassion (同情). And then you came down to my level. I was the one who was nervous,” he said. “I don’t normally have someone look me in the eye.”

   “They don't know what they are missing,” I told him.

   “My cold is nothing to brag about (自夸),” he said.

   “But that smile is so big.”

     Yes, and it's not only a big smile but an attitude.

古代和近代东西方的文明交往推动了人类社会的发展进程。请回答：

阅读下列材料：

回答：

（1）图一所示发明时由阿拉伯人传入欧洲？结合所学知识简述这一发明与图二所示事件的内在联系。

（2）近代以来，两次工业革命促进了西方工业文明的发展。请指出率先开展第一次工业革命的国家。从生产力发展角度看，两次工业革命将人类社会相继带入什么时代？

（3）在西方工业文明冲击下，中国近代化起步。请结合旧民主主义革命时期的历史举一例并以说明。如果据此进一步探究学习，你准备通过哪些途径来查找和收集史料？