The old farmer had his leg _______ but he had his tractors _______ day and night.

A．hurting; working

B．hurting; worked

C．hurt; working

D．hurt; worked

在100度以下加热介质能杀死致病菌和无芽孢细菌，不存在腐败菌，所以巴氏杀菌没有在常温下保持的要求。