英语问核科学

问题描述：

英语问核科学
1.every morning my son fills a bottle__boiled but cool water and then goes to school
a.in b.into c.with d.fron
2.don't make any noise in the library,__?
a,shall we b.will you c.do you d.can you
3you can't send your son to school until he is __
a.enough old b.old enough
科学的
要得到含杂质百分之二的生铁1000T,需要含杂质百分之二十的赤铁矿多少T?答案是1750 但是不知道怎么算 ,