[单项选择]

Walls and wail building have played a very important role in Chinese culture. These people, from the dim mists of prehistory have been wall-conscious; from the Neolithic period—when ramparts of pounded earth were used-to the Communist Revolution, walls were an essential part of any village. Not only towns and villages, the houses and the temples within them were somehow walled, and the houses also had no windows overlooking the street, thus giving the feeling of wandering around a huge maze. The name for "city" in Chinese means wall, and over these walled cities, villages, houses and temples presides the god of walls and mounts, whose duties were, and still are, to protect and be responsible for the welfare of the inhabitants. Thus a great and extremely laborious task such as constructing a wall, which was supposed to run through the country, must not have seemed such an absurdity.
However, it is indeed a commom mistake to perceive the great wall as a sing
A. they were designed to protect their kingdoms
B. the houses had no external windows
C. the name for cities means "wall"
D. walls have always been important there