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-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
D

试题分析: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
点评:名词是重要的语法概念,初中要掌握名词复数的不规则变化、对可数与不可数名词的区分、名词所有格等用法。对于不可数名词的复数,可用 a piece of 或是a packet of等来构成,如两则新闻可用two pieces of news。以“O”结尾的名词单复数变化,还可以通过巧学妙计进行:黑人(Negro)英雄(hero)在火山上(volcano)种土豆(potato)和西红柿(tomato)。
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