【題目】—Is Doctor Green ________ ORBIS doctor?

—No, he is ________UNICEF volunteer. But he sometimes works with ORBIS.

A. a; an B. an; a C. an; an D. a a

【答案】B

【解析】

試題分析:句意:——格林醫(yī)生是一名奧比斯的醫(yī)生嗎?——不,他是一名聯(lián)合國(guó)兒童基金會(huì)的志愿者。但有時(shí)和奧比斯醫(yī)生一起工作。因?yàn)?/span>ORBIS doctor是以元音音素開頭,前面用不定冠詞an;UNICEF volunteer是以輔音音素開頭,前面用不定冠詞a,故答案為B。

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