Unit7 How much are these socks?单元练习 一、单项选择(共 15 小题;共 15 分) 1. --- How much the bottles of milk?--- 31 yuan.A. areB. isC. amD. be 2. --- How much the socks?--- Three dollars.A. isB. areC. doD. does 3. --- the job in the police station exciting?--- Yes. But it is ...