某企业生产的家用无烟锅，采用特种陶瓷合金，传热快，受热均匀，无局部高温。相同条件下，对该无烟锅与普通锅进行加热对比测试后发现：①普通锅锅底与锅侧的温差比无烟锅大；②将锅体的温度控制在油烟产生的临界温度240℃以内，油烟都很少；③无烟锅中油的温度超过240℃，仍产生油烟。由此可以得出的结论是（   ）

钝角三角形的外心在（   ）

莎士比亚说：“书籍是全世界的营养品，生活里没有书籍，就像大地没有阳光，智慧里没有书籍，就好像鸟儿没有翅膀。”莎士比亚用生动的比喻说明书籍是人类的好朋友。购买的阅读书籍在我们的家庭消费中属于（    ）

That       is my mother．    

读短文，判断对错。
    My name's Alice. Look at my classroom. It's big and clean. The floor is green, the walls are white. The door is yellow and the windows are blue. Two pictures are on the wall. They are beautiful. How many lights are there? Nine! My desk is near the door. My schoolbag is on the desk. What's in my schoolbag? A pencil box, an English book, a maths book, a Chinese book, three storybooks and five notebooks. I like my classroom. I like my schoolbag too.