－What do we need to buy?
－ .
A. Two kilos of potatoes and two packets of salts
B. Two kilos of potatoes and two packet of salt
C. Two kiloes of potatos and two packets of salt
D. Two kilos of potatoes and two packets of salt
网友回答
A. Two kilos of potatoes and two packets of salts
B. Two kilos of potatoes and two packet of salt
C. Two kiloes of potatos and two packets of salt
(答案→)D. Two kilos of potatoes and two packets of salt
解析：句意：—我们需要买什么？—两公斤的土豆和两包盐。以o结尾的名词复数，有生命加es，无生命加s;盐是不可数名词，复数形式只要变量词部分，故选D