So far we have done a lot to build a low-carbon economy, but it is          ideal. We have to work still

harder.[      ]

A．far from         

B．more than

C．next to    

D．or else

关于网上订单的说法正确的有

A．网上订单合并时为了节省客户的配送费

B．支付成功的订单不能合并

C．按照软件系统的固定程序运行的网上单证出错几率较低

D．网上单证确认，是网上购物订单环节的最后一步