Are you looking for something fun and would you like to help other people in your free time? Then join us．
We have jobs for people of all ages；Anyone from twelve-year-old children to 80-year-old people can become one of us．
You can help people in many ways．Schools need help with taking care of children while their parents are working．Hospitals need us to look after children while their parents see a doctor．Animal lovers can help take care of those dogs and cats without homes．There is something to do for everyone．
"As a member of this group，I don’t want to get anything．Seeing the children's happy faces，I am happy，too．"said Susan，an old woman of 62．  
"I often played computer games in my free time before．Now I help older people learn how to use Computers，"said another one at the age of 18．
If everyone helps out a bit， we'll all have a better world to live in．
Interested? Call us on 3847613 or visit our website(网站)：http：//www．activol．com．

请运用“了解基本国策与发展战略”的相关知识，对材料进行分析。

下图是某海域海底岩石年龄分布图。读下图，要研究海底岩石年龄分布状况，并推测大洋地壳运动规律所用的地理信息技术是（    ）

2NaOH+SO₂═Na₂SO₃+H₂O …（a）

Na₂SO₃+H₂O+SO₂═2NaHSO₃…（b）

2NaHSO₃ $\underset{\_}{\underset{\_}{\Delta }}$ Na₂S₂O₅+H₂O …（c）

实验装置如图：