埋地乙炔管道，均可设置检查井，便于维修及检漏。
参考答案：错
—You can't imagine ________ fantastic fun online chatting is.
—Really？But it may cause a lot of trouble sometimes.
A．what A
B．how
C．why
D．so
为什么说审美是艺术最核心的功能？
