单选题 Each individual expresses his opinion in the group by where he stands when a lot of people ______ together in a chat.
【正确答案】 D
【答案解析】[分析] 近义词辨析 A．squeeze压榨，挤；B．stick粘住，粘贴；C．pad加上衬垫，填塞，铺张(文章等)； D．cluster使集成一串，群集于；因此D为答案。