题目

金属材料包括纯金属以及它们的合金。 （1） 地壳中含量最高的金属元素是。 （2） 钢铁是使用最多的金属材料。①生铁生产过程中，一氧化碳与氧化铁在高温下反应的化学方程式为。②对钢铁制品进行“发蓝”处理，使其表面生成一层致密的氧化膜，能有效防止钢铁锈蚀：防止锈蚀的原因是。 （3） 钛合金具有很多优良性能，工业上冶炼金属钛的主要原料是钛铁矿（主要成分是钛酸亚铁FeTiO3），FeTiO3中钛元素的化合价是。填空题用所给词语的适当形式填空。⑴Saturday is my ________ (busy) day in a week.⑵Her mother is getting ________ (fat) and ________ (fat).⑶I think it’s too expensive. I’d like a ________ (cheap) one.⑷He comes to school much ________ (early) than I.⑸This book is not as ________ (interesting) as that one.⑹Your classroom is ________ (wide) and ________ (bright) than ours.⑺Read as ________ (much) as you can.⑻The ________ (much), the ________ (good).⑼Nowadays, Chinese is ________ (important) than any other subject, I think.⑽Most of the students think a lion is much ________ (dangerous) than a bear and it is the ________ (dangerous) animal in the world.