Question

【题目】Covering ______ area of 16，800 square kilometers with a population of about 11 million，Beijing has 18 districts and counties under its jurisdiction(管辖)．

Answer 1

【答案】an

【解析】句意：占地16 800平方千米，拥有约1 100万人口的北京市，管辖着18个区和县。an area of...“面积是……”，是固定短语。