【英语问核科学1.everymorningmysonfillsabottle__boiledbutcoolwaterandthengoestoschoola.inb.intoc.withd.fron2.don'tmakeanynoiseinthelibrary,__?a,shallweb.willyouc.doyoud.canyou3youcan'tsendyoursontoschooluntil】

　　英语问核科学

　　1.everymorningmysonfillsabottle__boiledbutcoolwaterandthengoestoschool

　　a.inb.intoc.withd.fron

　　2.don'tmakeanynoiseinthelibrary,__?

　　a,shallweb.willyouc.doyoud.canyou

　　3youcan'tsendyoursontoschooluntilheis__

　　a.enougholdb.oldenough

　　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,