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．next to

C．out of

D．due to

渗流达西律υ＝kJ适用于（）。

A．地下水渗流

B．砂质土壤渗流

C．均质土壤层流渗流

D．地下水层流渗流