【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】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)合國兒童基金會志愿者。但是他有時和奧比斯醫(yī)生一起工作。因為ORBIS doctor是元音音素開頭，故用不定冠詞an修飾，UNICEF volunteer是輔音音素開頭，故用不定冠詞a修飾，故選B。

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