【正确答案】 B

【答案解析】解析：chat vi.／n．闲谈，聊天(如：They were chatting away about old times．He dropped in for a chat last night．)。talk vi.讲话，交谈；谈论(注：talk要比chat稍正式点：chat是闲聊的意思)。mutter vi．轻声低语，小声抱怨。whisper v.低语，耳语。