下列选项，氮元素的化合价由高到低顺序排列的是（　　）

①N₂②HNO₃③N₂O₃④NH₃．

A．①②③④

B．②③①④

C．②③④①

D．④③②①

—How are you going to spend this weekend?

—              the weather is fine, we’ll climb Mount Tai.

A．As well as

B．As good as

C．As soon as

D．As long as