—I feel bored with working all day.

—Why not         some sports to relax yourself?

A．fall down

B．hear from

C．look through

D．take up

古代中国人对牛有着特殊情感：吃猪肉但很少吃牛肉，杨柳青年画等民间风情画很多以牛为题材，民间有“牛郎织女”、“太上老君骑牛入函谷关”等传说……造成这一现象的关键原因是 [ ]

A．君主专制中央集权  

B．佛教的广泛传播

C．封建统治者实施愚民政策  

D．小农经济占主导地位