某溶液中先滴加稀盐酸，无现象，再滴加氯化钡溶液，有白色沉淀产生，该溶液（　　）

Monday, May 7, Sunny

    I had a pretty good time in Beijing last weekend with my parents and my brother.

    We went to Beijing by train on Friday night and got there on the morning of Saturday. We went to Tian'anmen Square first. There were many people there. We watched the national flag(国旗)go up. Then we went to the Palace Museum. My parents liked it very much, but I thought it was kind of boring. After lunch, we visited the Great Wall. When we got to the Great Wall, it started to rain. The rain made the mountains look very beautiful. We played on the Great Wall and took some photos. On Sunday morning, we visited a Beijing Hutong. Then after buying some things in Wangfujing Street in the afternoon, we went back home. We really enjoyed ourselves.

⑴题完成句子；(2)～(3)题简略回答问题；(4)题找出并写下全文的主题句；(5)题将文中画线句子译成汉语。

如图，抛物线y=x²+bx+c与x轴相交于A、B两点，点B的坐标为（3，0），与y轴相交于点C（0，﹣3），顶点为D．

“青菜青了，绿茵茵；辣椒红了，像灯笼…”反映的乡村聚落类型是（  ）