在硐室爆破作业中，可采用下列哪些器材来照明？（）
A.蜡烛
B.油灯
C.36V低电压
D.矿灯
参考答案：A, B, C
Then we put Christmas things the tree.[ ]
A. in
B. on
C. under
John is very________. If he promises to do something he'll do it. [ ]
A. independent
B. confident
C. reliable
D. flexible
