问题补充：
- What do we need to buy? - .
A. Two kilos of tomatoes and two packets of salts
B. Two kilos of tomatoes and two packet of salt
C. Two kiloes of tomatos and two packets of salt
D. Two kilos of tomatoes and two packets of salt
答案：
A. Two kilos of tomatoes and two packets of salts
B. Two kilos of tomatoes and two packet of salt
C. Two kiloes of tomatos and two packets of salt
(答案→)D. Two kilos of tomatoes and two packets of salt
解析：
试题分析: 句意：我们需要买什么？两千克西红柿和两袋盐。tomato西红柿，可数名词; satl盐，不可数名词；量词为kilo千克和packet袋，可变复数；故选D.
