孩子的模样很像自己的父母，这种现象说明了生物具有[ ]

A．适应性

B．遗传性

C．应激性

D．变异性

The lecturer began by _____ us where the island was, and went on _____ about its

history.

A．telling；talking

B．to tell；to talk

C．telling；to talk

D．he told；talking