题目

My first born son is mentally handicapped, yet in so many ways he is far wiser than I am. He has an intuitive(直觉的) knowledge of what is important in life. When we go out he looks people in the eyes, calls them by name, and shares his smile far more easily than I do. He goes through life with a soul full of love, joy and kindness that he gives to everyone he meets. He makes others feel better. He makes each day shine brighter. He makes this world more beautiful just by being in it. He may not understand everything in life, but he knows how to live happily and lovingly. He shows me （2012?咸宁）下列物质的用途中，主要利用其化学性质的是（　　）A．铜丝做导线B．干冰用作制冷剂C．一氧化碳炼铁D．石墨制铅笔芯