单选题 At the meeting both sides exchanged their views on a wide scope of topics they were interested in.
【正确答案】 D
【答案解析】[解析] 句意：会议上双方就感兴趣的许多话题交换了意见。extent：程度。number：数量。collection：收藏、系列。range：范围，最符合题意。