The Chinese government has decided to develop the west of China,   ，I dare say，will benefit the peoplethere，especially those who are still leading a poor life.

A．what

B．whatever

C．which

D．as

以下说法正确的是（）。

A.饱和萃取量是指料液的最大浓度

B.萃合物是指溶于水相的化合物

C.混合室的作用是加快传质过程的进行

D.澄清室的作用是使有机相和水相得到最佳分离