My English teacher has a strange way of making his class        and interesting.[ ]

A. boring

B. convenient

C. peaceful

D. lively

区域防突措施包括开采保护层和预抽煤层瓦斯两类，预抽煤层瓦斯可采用的方式有（）。

A.地面井抽煤层瓦斯

B.井下穿层钻孔

C.顺层钻孔

D.煤层卸压抽采