如图所示，a、b是地球表面北半球不同纬度上的两个点，如果把地球看作是一个球体，a、b两点随地球做匀速圆周运动，这两个点相同的（  ）

若一个太阳能热水器内装有100kg温度为20℃的水，阳光照射一天后，水温升高到80℃，则热水器内的水吸收了____  的太阳能，这是通过 ____ 方式改变了水的内能．

   I have a good friend at home. Her name is Mimi. She is white and yellow. She is very cute. I play with her when(当……的时候) I have time. She likes fish very much. When she is behind (在……之后) the sofa or in her box, you can’t see her. When I sit on the sofa, she sits with me. In the evening I do my homework at my desk, and she is on the desk. At that time I put her down(放下). Then she sits next to me. Is she a good friend of mine?

已知1.5³=3.375，则 =____．