[判断题]在运行的变电站手持绝缘物件不应超过本人的头顶，设备区内禁止撑伞。( )
A.正确
B.错误

Throughout the nineteenth century and into the twentieth, citizens of the United States maintained a bias against big cities. Most lived on farms and in small towns and believed cities to be centers of corruption, crime, poverty, and moral degradation. Their distrust was caused, in part, by a national ideology that proclaimed farming the greatest occupation and rural living superior to urban living. This attitude prevailed even as the number of urban dwellers increased and cities became an essential feature of the national landscape. Gradually, economic reality overcame ideology. Thousands abandoned the precarious life on the farm for more secure and better paying jobs in the city. But when these people migrated from the countryside, they carried their fears and suspicions with them. These new urbanites, already convinced that cities were overwhelmed with great problems, eagerly embraced the progressive reforms that promise
A. To explain how fast urban growth led to poorly designed cities.
B. To emphasize the economic importance of urban areas.
C. To suggest that labor disputes had become an urban problem.
D. To illustrate the need for construction of new factories.