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：---在乡下，你可以享受新鲜的空气，蔚蓝的天空，安静的环境。---难怪越来越多的退休的老人要逃离拥挤的城市。It is no wonder that...难怪... There is no doubt that...毫无疑问... There is no need to do...没必要做...There is no possibility that... 某事没有可能。故选A。
