C.
Read the sentence carefully and choose the letter of the correct answer.
1. What are the two factors in avoiding contamination of water supply?
a. proper water storage and disposal of waste
b.growth and development
C. carbon and oxygen
d.all of the above
2. What are the essential components which make life possible?
a.carbon dioxide and oxygen
b.carbon dioxide and nitrogen
c.oxygen and nitrogen
d.none of these
3.Where do water well and pump get its water?
a. river
b. water dam c. reservoirs d. aquifer
4.Which environmental sanitation is about providing clean drinking water
for everyone?
a.cleaning and keeping water supply safe
b.cleaning and keeping air safe
c.protecting food from pollution​