1919年5月26日，陈独秀在《山东问题与国民觉悟》中说：“我们因为山东问题，应该发生对外、对内两种彻底的觉悟，由这彻底的觉悟，应该抱定两大宗旨，就是:强力拥护公理！平民征服政府！”陈独秀提出“两大宗旨”的背景是（  ）

我国近年来积极采取包括发展新能源在内的措施应对全球气候变化。木薯是喜高温、不耐霜雪作物，也是生物质能源燃料乙醇（新能源）的重要原料。每生产燃料乙醇1吨需要消耗鲜木薯约7.5吨。下图是某省级行政区年均温分布图，读图和材料回答下列小题。

根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。

    Anne is a newspaper reporter. She chose this  1 so she could travel around the world. The work has taught her many 2lessons. She has seen wars, earthquakes and death. But she has also seen courage, hope and happiness.

    Last year, she won an award for her reporting in Africa. She was very 3 of it. At first, she thought she got the award because of her good work. But then she realized that she should 4 many other people for their help.

    Anne was born in Jamaica. Her family was not poor, but it was not 5, either. Her parents had to 6 hard so that she could go to school. At school. Anne was not a good student, but she 7 writing because what her English teacher said, “Anne, you are a wonderful 8.” The teacher encouraged her all the time.

    Later, Anne went to university in Canada and then 9 for a job. It was very difficult. Then, one day, she went to see the editor of a newspaper in Ottawa. The editor gave her a job. “Everyone needs a 10 at first.” he said.

（1）煤燃烧的反应热可通过以下两个途径来利用：a．利用煤在充足的空气中直接燃烧产生的反应热；b．先使煤与水蒸气反应得到氢气和一氧化碳，然后使得到的氢气和一氧化碳在充足的空气中燃烧．这两个过程的热化学方程式为：

a．C（s）+O₂（g）═CO₂（g）△H=E₁①

b．C（s）+H₂O（g）═CO（g）+H₂（g）△H=E₂②

H₂（g）+$\frac{1}{2}$O₂（g）═H₂O（g）△H=E₃③

CO（g）+$\frac{1}{2}$O₂（g）═CO₂（g）△H=E₄④

请表达E₁、E₂、E₃、E₄之间的关系为E₂=____ ．

（2）如图所示是1摩尔NO₂和1摩尔CO完全反应生成CO₂和NO过程中能量变化示意图，请写出NO₂和CO反应的热化学方程式：____ 　．

（3）化学反应的焓变与反应物和生成物的键能有关．已知某些化学键的键能如下表所示：

则反应：H₂（g）+Cl₂（g）═2HCl（g）的焓变△H=____ ．

设向量$\overrightarrow{a}$，$\overrightarrow{b}$满足|$\overrightarrow{a}$+$\overrightarrow{b}$|=$\sqrt{10}$，|$\overrightarrow{a}$﹣$\overrightarrow{b}$|=$\sqrt{6}$，则$\overrightarrow{a}$•$\overrightarrow{b}$=____