将盛有一定浓度蔗糖溶液的透析袋口扎紧后浸于蒸馏水中，下列表示透析袋中蔗糖溶液浓度与时间的关系，正确的是[ ]

A．

B．

C．

D．

--I came ___ two idioms which puzzled me on the cover of an old book which I was looking for a new material in yesterday.

---Why not go to the teacher for ___ about them?

A．with, an advice

B．to . advice

C．across, advice

D．up, advice