下列选项中属于网上购物技巧的是（）

A.要选择信誉好的网上商店，以免被骗。

B.仔细查看商品，认真查看网上商店的交易评价。

C.货比三家，选择性价比好的商品。

D.以上都是

Servants, as employment that attracts more and more people, are not_________ as they were in the past.

A．looked down upon

B．carried on

C．paid attention to

D．referred to