已知α为锐角，sin（α﹣20°）=$\frac{\sqrt{3}}{2}$，则α=（　　）

达州盛产天然气，有“中国气都”之称的美誉．天然气的主要成分是甲烷（CH₄），我校化学兴趣小组的同学对甲烷燃烧的产物产生了兴趣．请你参与：提出问题：甲烷燃烧后生成哪些物质？

查阅资料：含碳元素的物质完全燃烧生成CO₂，不完全燃烧生成CO；无水CuSO₄遇水变蓝．

如图所示，“套圈”出手后，从a点到c点的过程中(不计空气阻力)，下列说法正确的是 （     ）

完形填空。

    Tom and his father are 1 in the playground. There is a cat and a dog there.  They are playing with a ball together. “I think the cat is 2 than the dog," Tom says, “I don't think so," his father says. “Why?"  “Because the dog looks 3 than the cat " Tom laughs and says, "But I like the cat.  It is white and it is 4 than the dog. " Tom's father says, “Dogs are my favourite animals because they are very 5 to me " "Yes, but I like smaller ones. Can we keep one?" Tom says. "of course," Tom's father says.