— Any fashion news about skirts?

— Yes. This season’s short skirts have gained popularity now, although they         to be shocking at first.

A．have been thought

B．were thought

C．are thought

D．had thought

根据现行《火灾自动报警系统设计规范》，火灾自动报警系统中，消防通讯设备等的电源宜采用（）供电

A.接地交流

B.UPS装置

C.照明电源

D.消防电源