【題目】Is this _____apple?

A. a B. an C. the D. /

【答案】B

【解析】句意：這是一個(gè)蘋果嗎？不定冠詞a/an，意思是一個(gè)，a用于輔音開頭的單詞前，an用于元音開頭的單詞前，定冠詞the意思是這個(gè)，那個(gè)，用于上文提到的東西或人；apple元音音素開頭，故選B

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