制作某种机器零件，小明做220个零件与小芳做180个零件所用的时间相同，已知小明每小时比小芳多做20个零件．设小芳每小时做x个零件，则可列方程为 ____.
甲、乙两种固体物质的溶解度曲线如右图所示，下列说法中，正确的是（ ）
东南亚唯一的内陆国是
⑴I'm listening to music ____ A. but the teacher comes.
⑵Lucy is playing with her dog,____ B. but my friends come to play with me.
⑶The pupils are talking very loudly,____ C. but her mother calls her.
⑷A bus is coming,____ D. but it starts to rain.
⑸We are having a picnic,____ E. but there are too many people on the bus.
