In his lecture, the professor referred to the belief, in contrast to all other countries, _____ the elderly are wise, _____ is particularly dominant(占优势的) in the Chinese culture．

A．that; one that

B．that; that

C．which, which

D．that; one

保护生物多样性的三个层次中，最核心的且关系到其它两个层次存亡的是[ ]

A．基因多样性

B．物种多样性

C．生态系统多样性

D．生物群落多样性