There are many people in the bus. Some have seats, but some have to stand. At a bus stop, a woman gets on the bus. An old man hears the door and tries to stand up. “Oh, no ，thank you", the woman forces（强迫）him back to the seat. "Please don't do that. I can stand." "But, madam. Let me…,”says the man. "I ask you to keep your seat." the woman says. She puts her hands on the old man's shoulder. But the man still tries to stand up, "Madam, will you please let me？”“Oh, no," says the woman, she again forces the man back. At last the old man shouts（大声喊），“I want to get off the bus!”

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有____条线段

①自觉履行社会责任，不言代价与回报            ②爱岗敬业，让自身价值在奉献中提升

③献身国防才能实现人生价值，获得荣誉        ④服务社会，努力做一个负责任的公民

资料一：1630年，海尔蒙特发现在一些洞穴处，有一种能使燃着的蜡烛熄灭的气体，后来被证实是CO₂。

资料二：1754年，布莱克将石灰石锻烧首次制得CO₂，并完成了如下所示的物质转化研究。

资料三：1766年，卡文迪许通过实验测得，室温下1体积水大约能溶解1体积二氧化碳气体。