How many ________do you have?
A.tooth             B.teeth               C.tooths
B

試題分析：句意：你有多少顆牙齒？tooth牙齒，復(fù)數(shù)形式為teeth，how many修飾可數(shù)名詞的復(fù)數(shù)形式，故選B
點(diǎn)評(píng)：名詞是重要的語(yǔ)法概念，初中要掌握名詞復(fù)數(shù)的不規(guī)則變化、對(duì)可數(shù)與不可數(shù)名詞的區(qū)分、名詞所有格等用法。對(duì)于不可數(shù)名詞的復(fù)數(shù)，可用 a piece of 或是a packet of等來(lái)構(gòu)成，如兩則新聞可用two pieces of news。諸如foot腳的復(fù)數(shù)形式是feet,這類詞都是改為oo為ee；以“O”結(jié)尾的名詞單復(fù)數(shù)變化，還可以通過(guò)巧學(xué)妙計(jì)進(jìn)行：黑人（Negro）英雄（hero）在火山上（volcano）種土豆（potato）和西紅柿（tomato）。
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