. It is far better for one to drink milk, ________ one gets healthful nutrients, than to drink coffee, ________ contains harmful substances.

A．what, what

B．where, which

C．from which, which

D．in which, what

能最快获取答案的提问形式是( )。

A．封闭式提问　

B．开放式提问　

C．探索式提问　

D．咨询式提问