18.---I hear ________ of the old people in the meeting room ________ teachers.
---Yes._______ old man behind Mary is ________university teacher.(  )
A.sixtieth percent; is; An; anB.sixty percents; are; A; the
C.two third; is; The; anD.two thirds; are; The; a

分析 --我聽說會(huì)議室里三分之二的老人是老師.
--是的.在Mary后面的那個(gè)老人是個(gè)大學(xué)老師.

解答 答案:D.
分?jǐn)?shù)的表達(dá)形式為:基數(shù)詞(分子)+序數(shù)詞(分母),分子大于一時(shí)分母加s.根據(jù)本規(guī)則三分之二應(yīng)該是two thirds;old man后面有介詞短語修飾,這里應(yīng)該是特指,所以用定冠詞the,university teacher在這里表示類別,university[?ju:n??v?:s?ti],以輔音音素開頭,所以應(yīng)該用a.故選D.

點(diǎn)評(píng) 本題考查分?jǐn)?shù)的用法,考生在掌握基礎(chǔ)知識(shí)的基礎(chǔ)上結(jié)合語境可正確作答.

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