Travel is a very good activity. When traveling, you can relax小题1:  ,forget your tiredness or troubles, and have the energy to take on the new tasks waiting for you.

But sometimes traveling is 小题2:   an enjoyable thing. For example, the weather can be changeable, If you climb a mountain, it may rain suddenly. You may be caught小题3:   the rain and may catch a cold. The worst thing is that you may have your money stolen 小题4:   you may have an injury. All these terrible things are 小题5:  can happen to you .

Therefore, when you are going on a trip, you 小题6:   make a good preparation. Firstly, you must have clear information about the weather. Secondly, you should choose小题7:___good companion so that you can help each other. Thirdly, you must be careful enough and try to avoid accidents. 小题8:  you do this, you will surely enjoy your travel.

( )在开挖区未爆之前先行爆破，保护保留岩体或邻近建筑物免受爆破破坏。

A．浅孔爆破法

B．深孔爆破法

C．洞室爆破法

D．预裂爆破法