题目

One day, a farmer was walking along a road with his son Thomas. The father said, “Look! There’s a horseshoe, pick it up and put it in your bag.” Thomas said, “It isn’t worth the trouble.” His father said nothing but he picked it up himself. When they got to a nearby town, they had a rest. There the farmer sold the horseshoe and with the few pennies he bought some cherries(樱桃).The father and the son continued their way. The sun was well up in the sky, and there wasn’t a house or even a tree where they could have a rest. Thomas felt too thirsty to walk on. At this time, his fat生活离不开化学，化学与我们生活息息相关，用下列生活中常见物质来完成以下各题：A．二氧化碳B．烧碱C．熟石灰D．硝酸铵用物质的化学式填空：能做气体干燥剂的是______；用作氮肥的是______；能用于灭火的是______；用作建筑材料的是______。