阅读短文，根据其内容回答问题。
These days, many Chinese people are happy about a piece of news. What is it? China may become the second largest economy (经济体) in the world. It’s only behind the US.
But is China the second richest country, too?
No. The economy is like a cake. The US, Japan and China each makes one. China makes the second biggest cake. But lots of people have to eat it. Why? There are 1.3 billion people in China. And there are only 300 million people in the US and 127 million in Japan. So, in China, each person only gets a very, very small piece of cake. But people in the US and Japan have bigger pieces.
China is not as rich as the US and Japan. For example, in the US, in every 100 people, 75 can surf the Internet; in Japan it is 74 in 100. But in China, only 26 people in 100 use the Internet.
China’s large economy brings good things. People in China have more jobs and money. We also have more influence (影响) in the world.

（Ⅰ）求C₂与C₃交点的直角坐标；

（Ⅱ）若C₂与C₁相交于点A，C₃与C₁相交于点B，求|AB|的最大值．

    ①真没想到，在罗马，最吸引人的地方是废墟。

    ②一座座倾塌的城墙，一间间残破的宫殿，一根根班驳脱榫的石梁，一个个缺手少臂的雕像，以及一条条被毁坏得不咸形状的通道随处可见，或掩映在绿树丛中，或竖立在草坪之上，或横亘在街边路旁，或紧靠着新的建筑。尤其使人惊讶的是，绝大多数废墟在罗马市区的中心，而且完好地保存在显眼醒目之处。凝视着这些废墟，我忽然发现罗马充满着一种残缺的美，一种古旧的美。是的，比起完整的建筑来，残缺的废墟更能给人以振撼，更能给人以深思，更能给人以力量，更能给人以启迪。

    ③a于是，我不由惊叹和钦佩起罗马人来。b他们不愧是具有远见卓识的一族。C因为他们深深地懂得，废墟是历史的遗物和文明的见证，毁掉了废墟也就毁掉了历史和文明。d这无异于是民族精神的自杀。e只有尊重废墟，才能超越废墟，去创造新的辉煌。f正因为废墟有着永恒的巨大的魅力，罗马也就成了全世界人都向往的地方，每天从四面八方来废墟游览的人络绎不绝、摩肩接踵。g罗马人把废墟变成了宝贝，变成了无与伦比的财富。

    ④罗马废墟，一个千古流传之绝响，一个万世不灭之辉煌。