①C﹣12与C﹣13的化学性质____（填“相同”或“不相同”）；

②如果C﹣14与O原子结合成CO₂，则这种CO₂的相对分子质量是____

随着城镇化进程的加快，公共交通发展之后、交通拥堵等问题也相伴而生，被称为最快捷、不被堵的电动自行车因而受到人们的青睐，成为出行的首选。目前，郑州区域的电动车保有量大约300多万辆。由于数量庞大、部分车主规则意识不强、非机动车道常被挤占等原因，电动车乱象丛生。为此，2016年发布的《畅通郑州白皮书》强调要加强对电动自行车的管理，完善电动自行车相关法规。

阅读材料，联系所学知识，思考下列问题：

      Hello, I'm Vladislav. For my summer holidays, I usually stay in a country house near Moscow.
      Last summer, my dad's brother gave me a present — a blue bike. At that time I couldn't ride it very well. One day I got into an accident. But don't worry, everything was OK, just some “little” injuries.That day, I tried to ride my bike and suddenly it began to move very fast. I couldn't stop the bike. So I fell into a ditch (沟) full of dirty water. When I thought I had had enough bad luck, a girl walked by. She saw the bike and me. I quickly stood up.
   “Are you fishing here?” she asked.
   “Yes,” I answered. Then I said, “I'm making fish soup for dinner. Would you like to come?” To my surprise, she agreed.
      After that we became friends. Now, we often send each other e-mails. She knows that I’m studying in China and she asks me questions about Chinese culture. I tell her my stories of China, and she says she wants to visit China, too. She even plans to study Chinese. This is how, with the help of my bike, China got one more Russian friend.
根据短文内容，回答下列问题。