①生活是丰富多彩的，每个人的情趣也是多种多样的 ②我们应该结合自己的兴趣爱好、自身特点，培养适合自己的情趣 ③我们在培养自己情趣的同时，也要尊重他人的情趣 ④自己培养什么样的情趣，必须要求他人也要培养同样的情趣

下列哪一组动物都是恒温动物（　　）

   Mr Smith 1from London. Now he is in China. He is 2 .He teaches 3 a middle school. He works very hard. His students like 4 very much. He can 5 a little Chinese . His students often teaches him Chinese 6 Sundays. Mr Smith likes playing football . He often plays football 7 his students.
   Mr Smith8  a son. His name is Jack. He is student. He studies in a middle school. He goes to school  9 bike everyday. He gets back home at four in the afternoon. He likes 10 TV in the evening.

下列能正确表示食物链的是（ ）

某品牌自行车进价为每辆800元，标价为每辆1200元．店庆期间，商场为了答谢顾客，进行打折促销活动，但是要保证利润率不低于5%，则最多可打____折．