a. snow plow n.铲雪机
plow vt.翻(土);(犁)田
例:Farmers used to plow the fields with oxen.
(农民以前都用牛犁田。)

oxen .阉过的公牛(复数)
ox 阉过的公牛(单数)

b. path n.(人/车行进的)道路;小径
例：Two men blocked Tom's path and robbed him.
(两名男子堵住汤姆的去路抢劫他。)
We went down a path through the woods.
(我们在林中沿着小径而行。)

答案：
D