题目内容：
Whydoestheauthorsaythatnothingwaswastedbeforetheinventionoffridges?
A．Peoplewouldnotbuymorefoodthanwasnecessary． B．Foodwasdeliveredtopeopletwoorthreetimesaweek．
C．Foodwassoldfreshanddidnotgetrotteneasily．
D．Peoplehadeffectivewaystopreservetheirfood．
参考答案：
答案解析：