These wild flowers are so special, I would do _____ I can to save them. [ ]

A. whatever

B. that

C. which

D. whichever

我国地势的特征是（　　）

A．东高西低，呈阶梯状分布

B．西高东低，呈阶梯状分布

C．东高西低，呈斜坡状分布

D．西高东低，呈斜坡状分布