When municipal water treatment plants are not available, which of the following methods of purification might be utilized?
A) chemical purification with chlorine
B) reverse osmosis
C) chemical purification with iodine
D) boiling
E) C and D
Question 2
Because vitamins are so good for us, it is important that we ________.
A) take large quantities of them
B) obtain them only from the foods we eat
C) be mindful not to take excessive quantities of them
D) spend lots of money buying mega-vitamin supplements
