_____ with the size of the whole earth, the biggest ocean does not seem big at all. [ ]

A. Compare

B. When comparing

C. Comparing

D. When compared

对心脏抑制作用最强：

A．地尔硫卓
B．尼群地平
C．尼莫地平
D．硝苯地平
E．维拉帕米