A、economic
B、social
C、competitive
D、comparative
A、The compound is necessary for health, but the body is unable to synthesize enough of the compound to maintain health
B、The compound prevents chronic disease and cancer.
C、The compound is best absorbed if taken in supplement form.
D、The body is unable to synthesize the compound.
A、All vitamins consumed in excess are excreted.
B、Supplemental vitamins are better than those from food.
C、Occasional lapses in vitamin intake should cause no harm.
D、It is hard to get all the vitamins we need from food.
A、Water-soluble vitamins are best absorbed in the presence of dietary fat.
B、Fat-soluble vitamins have much less potential for toxicity.
C、Water-soluble are less likely to be toxic.
D、Water-soluble vitamins are stored, whereas fat-soluble vitamins are excreted readily.
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