1.what do you four over the steel wool? A.water B.vinegar C.plastic glass D.stell wool pool 2.how should you observe the colour of the steel wool A.immediately

1.what do you four over the steel wool?
A.water
B.vinegar
C.plastic glass
D.stell wool pool

2.how should you observe the colour of the steel wool
A.immediately and periodically
B.slowly and periodically
C.immediately and once
D.slowly and once

3.what is the colour of the steel wool as time passes?
A.blackish
B.brownishred
C.brownish
D.reddish brown

4.materials a coorse steel wool pool the underlined word can be replaced by
A.obrasive
B.smooth
C.soft
D.hard