题目

—______go to a movie tonight? —It’s a good idea A．What about                    B．Would you like                 C．Why not 答案：C1．买3支圆珠笔和2支铅笔要8.7元，买2支圆珠笔和3支铅笔要6.8元，圆珠笔和铅笔的单价各是多少？