阅读以下材料，并回答相关问题

材料一：乾隆二十二年（1757年），清政府规定广州是允许外商来华贸易的唯一口岸，而且即使在广州也百般限制中国人与外商接触。政府特许的“十三行”不仅垄断了与外商的经济往来，还代表政府出面办理交涉事宜。

材料二：乾隆皇帝在给英王乔治二世的信中说：“天朝物产丰盈，无所不有，原不籍外夷货物以通有无，特因天朝所产茶叶、丝帛为西洋各国及尔国必须之物，是以加思体恤。”

“野火烧不尽，春风吹又生”，说明生物所具有的特征是（  ）

阅读理解

    I was traveling alone through the UK. To reach places that were off the public transportation map，I bought an old car, which cost most of my money. I couldn't afford to stay in the hotel, so I had to camp in my car for the rest of the trip.

    One morning I awoke in my old car on a country road in Ireland and saw a single house. The water in my thermos (保温瓶）had gone cold, so I knocked on the door of the house. A woman opened it. I asked her for some hot water. But she wouldn't let me get away with just that! I was invited indoors. She asked me to sit at the table and have breakfast with her family. They filled my thermos before I left.

I was greatly moved. And I decided to pass the kindness on. The other day I met a young man who had been driving around to look for a parking lot. He looked increasingly upset. I was glad that I was able to point one out to him. His thankful smile was the hugest reward (奖赏）for me.

下列说法：

①平分弦的直径垂直于弦；②三点确定一个圆；③相等的圆心角所对的弧相等；④垂直于半径的直线是圆的切线；⑤三角形的内心到三条边的距离相等。

其中不正确的有（　）个。