Six are eating grass at the foot of the hill.A. sheepsB. sheepC. sheepesD. shoop

问题补充：

Six are eating grass at the foot of the hill.

A. sheeps

B. sheep

C. sheepes

D. shoop

答案：

A. sheeps

(答案→)B. sheep

C. sheepes

D. shoop

解析：sheep单数和复数相同，还有deer ,fish, Swiss, Japanese等等。