B
句意:在周末,爱丽丝有三种类型的课。
A 四 B 三 C 五
根据文章1-3行:
At weekends, I'm very busy. I have to learn to play the piano on Saturday morning. And on Saturday afternoon, I have a swimming lesson. And then I still have Maths lessons on Sunday morning. (在周末,我很忙。我必须在星期六早上学习弹钢琴。星期六下午,我有一节游泳课。然后我星期天早上还有数学课。)
钢琴、游泳、数学,加起来是三种课。
故选B