钾、钠和白磷等暴露在空气中易燃烧,所以钾、钠应保存于（）中,取用这些物质时应使用镊子夹取

or troubleTravel 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.

A、printf("/n%d/n",ch);
B、putchar(ch);
C、printf("/n%c/n",ch);
D、printf("%e/n",ch);