what never asks questions but always gets answers?

谜题：what never asks questions but always gets answers?
 
（参考答案及解析在第二页）

谜底：a doorbell.
 
难度：★★★
 
谜语解析：略

上一篇：味精太多（打一英文单词）
下一篇：I look like a horse ,but my body is covered by black and whi