南方热带雨林生态系统与农田生态系统相比，南方热带雨林生态系统的稳定性要强的多，你认为与此相关的原因是[ ]

A．南方热带雨林生态系统所含的生物种类多，食物链和食物网更加复杂

B．南方热带雨林生态系统的雨水充足

C．农田生态系统受到人们的破坏严重

D．农田生态系统中一般只有植物，而南方热带雨林生态系统中还有动物

Yesterday evening I came across the man _____ you think is pleased to _____.

A．who, talk

B．whom, get along with

C．who, work with

D．whom, be talked with