2.综合布线系统通常采用（    ）。
A、总线型拓扑结构  
B、环形拓扑结构
C、树形拓扑结构   
D、分层星状拓扑结构

单项选择题Last year some additional measures to protect customers personal information _____by our company.A. are takenB. were takenC. have been takenD. will be taken

多项选择题强调让逝者回归大自然的丧葬方式有（ ）等。