前探支架可用于松软煤层的平巷工作面，一般是向工作面前方打钻孔，孔内插入钢管或钢轨，其长度可按两次掘进循环的长度再加0.5m，每掘进一次打一排钻孔，形成两排钻孔交替前进，钻孔间距为（）

A、0.2～0.3m

B、0.3～0.4m

C、0.4～0.5m

D、0.5～0.6m

Speaker A: Did you hear about those people who got hurt when going mountain climbing I think they shouldn’t allow people to go mountain climbing. It’s too dangerous.
Speaker B: （）。

A. I couldn’t agree more. I can’t understand why anyone wants to get to the top of a mountain.

B. I couldn’t agree less. Mountain climbing is actually more dangerous than surfing.

C. I’m sorry to hear that. Where did you get the news

D. No, I have decided not to go mountain climbing with my friends next month.