A-A+
Why does the author mention doorbell rings？A．I
问题详情
Why does the author mention doorbell rings？
A．It is a type of information.
B．It is a type of break.
C．It is a type of incentive.
D．It is a type of warning.
参考答案
正确答案：B
解析：事实细节题。选项A不是作者提出的原因。原文没有提到选项C和选项D。因此正确答案是B。
