-- In the countryside you can enjoy fresh air, blue sky and quiet surroundings.

--- _______ more and more retired people are escaping from the crowded city.

A．It is no wonder

B．It is no doubt

C．There is no need

D．There is no possibility

作业的标准化就要要求每一个岗位、每一道工序都有一份作业指导书，然后检查员工是否按照作业指导书的要求工作。