Our previous school building,______ like an“E”, was built in1961.

A．being shaped

B．to be shaped

C．shaping

D．shaped

煤矿生产中常见的灾害是（）。

A．顶板事故

B．矿井水灾

C．矿井火灾

D．瓦斯爆炸

E．煤尘爆炸