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

问题补充：

---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

答案：

(答案→)A. It is no wonder

B. It is no doubt

C. there is no need

D. there is no possibility

解析：句意，这里想表达难怪越来越多的退休的人正在逃离拥挤的城市。It is no wonder是固定的用法，意思是难怪。