题干
— I’d like to fix an appointment with the director. Would nine tomorrow morning be all right?
— ________. He’s got rather a full day tomorrow.
— ________. He’s got rather a full day tomorrow.
A：I’m afraid not
B：Never mind
C：It doesn’t matter
D：Don’t mention it
答案(点此获取答案解析）
A
表后，峰时段（早上八点到晚上九点）的电价为0.55元/ kW·h，谷时段（晚上九点到次日早上八点）的电价为0.35元/ kW·h.对于一个平均每月用电量为200 kW·h的家庭，换装分时电表后，每月节省的电费不少于原来电费的 10%，则这个家庭每月在峰时段的平均用电量至多为( )