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    One day, Howard Kelly, a poor boy who was selling goods from door to door in order to pay his way through school, found he had only one coin left, and he was hungry.

    He decided he would ask for a meal at the next house. However, he became very nervous when a lovely young woman opened the door. Instead of a meal he asked for a drink of water.

    Young woman thought he looked hungry so she brought him a large glass of milk. He drank it slowly, and then asked, “How much do I owe(欠) you?”

     “You don't owe me anything,” she replied, “We never accept payment for a kindness.” He said, “Then I thank you from my heart.”

    Years later that young woman became very ill and was finally sent to the big city, where they called in specialists (专家）to study her rare disease. Dr. Howard Kelly was called in for the consultation (咨询). When he heard the name of the town she came from, he went to her room. He recognized her at once. He decided to do his best to save her life.

    After a long struggle, the battle was won. The woman thought it would take the rest of her life to pay for the final bill. But when she saw the bill, she read these words: “Paid in full with one glass of milk” (Signed by Dr. Howard Kelly).

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下列选项中，对我国处于社会主义初级阶段这一基本国情的认识，正确的是（　　）

①就是不发达阶段

②是由党的基本路线决定的

③是实现科学发展的政治保证

④是建设中国特色社会主义的总依据

⑤是当代中国发展和进步的根本方向

如图，一端开口、另一端封闭的细长薄壁玻璃管水平放置，内有用水银柱封闭的体积为10mL的某种理想气体．外界大气压为1标准大气压，环境温度为27℃，阿伏伽德罗常数约为6×10²³mol^－1，标准状况下1mol该气体体积约为22.4L．求：

狗无论走出多远，都能顺利地返回家，狗能返家的信息来自（    ）