— What do you do on the farm? 

— My job is to feed (喂养) the animals, such as            and           . [ ]

A. horses, sheeps

B. horse, sheep

C. horse, sheeps

D. horses, sheep

冠心病患者出现心前区收缩期喀喇音及收缩中期吹风样杂音，是由于（）

A.心肌硬化

B.室间隔穿孔

C.二尖瓣脱垂

D.二尖瓣相对关闭不全

E.心力衰竭