That activity was great. So it_______our teacher very much.  [ ]

A. please    

B. pleased  

C. pleasure    

D. pleased to

井下探查治理陷落柱时，应（）。

A．沿煤层布置探放陷落柱水钻孔

B．钻孔一般按扇形布设

C．钻孔终孔位置满足平距不超过3m

D．超前距和帮距符合《煤矿防治水规定》要求