A fantastic idea occurred to him ________ he could use a plastic bottle, ________ cut off, as a container to grow young plants in.

A．which; whose top

B．that; the top of which

C．that; with its top

D．whether; whose top

乐于助人、共享为荣的观念有利于孩子克服自我中心，盲目归类、乱下结论反而会强化孩子的自我中心行为。