硅铁铝率
参考答案：用硅铁铝率来表示母质风化程度的度量指标，是指土壤母质中二氧化硅与氧化铁和氧化铝分子含量的比值（SiO2/（Fe2O3+Al2O3））。
I'm __________ tired, because I have __________ homework.[ ]
A. too much, too many
B. much too, too much
C. much too, too many
D. too many, too much
运输爆炸品（烟花爆竹除外）、硝酸铵实行全程（）押运
