通过化学学习我们认识了许多的物质，请回答以下问题：
（1）氮气约占空气体积的____；供给呼吸的气体是____．
（2）煤、石油和____是重要的化石燃料，大量使用化石燃料会使二氧化碳过多的排放，导致全球变暖．科学家采用高新技术，将二氧化碳和氢气在一定条件下组合，生成一种重要的化工原料乙烯（C₂H₄）和水，该反应的化学方程式为____．
（3）下列日常生活中的做法，符合“低碳生活”理念的是____（填字母，下同）．
A．节约使用纸张     B．分类回收处理垃圾
C．减少使用塑料袋    D．减少使用一次性纸杯
（4）上海世博会在环保节能方面有一些新技术、新能源和新材料．下列表述不属于上述情况的是____．
A．太阳能的利用                      B．地源热泵节能技术的使用
C．世博会开幕倒计时                  D．园区内交通工具实现零排放
E、优化建筑设计，增强室内自然采光，减少照明用电．

阅读下列短文,从每小题所给的A、B、C、D四个选项中选出一个最佳选项。

Dear Bill

    Thank you for your letter（信件). You tell me something about your family. Now I'll talk about my family.

    I have a happy family. We love each other. My grandparents are doctors. They work in Canada now. My parents are both teachers. They teach English at Luoyang International School. My sister and I are in Luoyang with them.

    I'm 13 years old. I'm a student in Grade Seven. I like my teacher and my friends in China . They often help me. I want to be a Chinese doctor when I grow up . Now I can speak Chinese. My sister, Jane, is only three years old. She is very cute . She has brown hair and blue eyes. We all love her.China is very beautiful. Welcome to China.

Yours

Frank

体现孔子思想中保守性一面的是（     ）