以下关于丘疹的描述正确的是（）。

A.隆起于皮面

B.不累及真皮

C.表面可粗糙或光滑

D.可扩大或融合形成斑块

--Which of the following sentence is right?

--I wonder _________.

A．who broke the window

B．whose pen is this?

C．which room I will live

D．what’s the population of China