题目

句型转换。 （1） Rick often brushes teeth at 6: 30.（对画线部分提问） （2） He has lunch at 11:50.（改为一般疑问句） （3） I go to bed at nine twenty, too.（改为否定句） （4） They usually exercise on weekends.（对面线部分提问） （5） I watch TV. I play the guitar. (用either……or……连成一句） 答案：What time does Rick often brush teeth? Does he have lunch at 11:50? I don't go to bed at nine twenty, either. When do they usually exercise? I either watch TV or play the guitar. 直角三角形的周长为定值l，则斜边的最小值为________．