请问这句英语的谓语应该是单数还是复数?

问题描述:

请问这句英语的谓语应该是单数还是复数?
The phone you choose and the way you use it speaks volumes about your personality and lifestyle.
speak volumes ,意思为“有力地说明,充分地证明”,在这里是谓语吧?而前面是and连接的“The phone ”,“the way ”两个并列的主语吧,我认为应该是复数啊,为什么用speaks呢?难道是我理解错了?请求英语高手相助!

The phone you choose and the way you use it 这说的是她打电话的整件事,一件啊,所以是单数The phone you choose and the way you use 这样的话,用复数例:A doctor and teacher is clever.一个既是医生,又是老师的...