_P‚Äö√á√áO‚Äö√á√ñ content in superphosphate is about __________ percent.$?

_P‚Äö√á√áO‚Äö√á√ñ content in superphosphate is abo

1.	_P‚Äö√á√áO‚Äö√á√ñ content in superphosphate is about __________ percent.$?
A.	30-35
B.	15-20
C.	65-70
D.	85-90
Answer» C. 65-70