Megalopolis is the sociologist' s name for a .
A.suburban area around a city
B.large city and its suburbs
C.group of towns organized as a city
D.group of cities blending to form. one huge city

单项选择题All of the following suggestions are made in the first paragraph for the improvement of the land conditions in the poor countries except______.A.new farming methods to be introducedB.people to be educatedC.reliable sources of water and energy to be suppliedD.better living conditions to be provided

单项选择题Windows提供了各种磁盘管理工具来帮助用户管理磁盘,其中____可以诊断和修复各种类型的磁盘损坏的错误。A. 磁盘碎片整理程序B. 磁盘空间管理C. 磁盘检查D. 备份程序