题目

看图，补全对话。Mr. Li: Good morning, Cutie!Curie: Good 1.________. Mr. Li!Mr. Li: This is my 2.________ . I have some animals here.Curie: Oh. Your farm is big.Mr. Li: Thank you. Let’s go and see the animals.Cutie: 3. ________!Mr. Li: Look at the white sheep.Cutie: What do they like?Mr. Li: They like eating 4.________.Cutie: I love these 5.________ . 答案：【答案】1. morning 2. farm 3. Great 4. grass 5. sheep 【解析】略函数f（x）=ex（x2-2x）的单调递减区间为    ．