The consolidation of the crumbling walls and towers has been carried out ______ a program agreed with the Department of the Environment.

A．in case of

B．in accordance with

C．in place of

D．in charge of

ADSL技术的特点（）。

A.直接利用用户现有电话线路，节省投资；

B.采用点对点的拓扑结构，用户可独享高带宽.

C.节省费用，上网、通话互不影响.

D.安装简单，只需要在普通电话线上加装ADSLMODEM，在电脑上装上网卡即可。