Whicn vitamin can reduce the curative effect of levodopa() A: vitamin A B: vitamin B1 C: vitamin B2 D: vitamin B6 E: vitamin B12

Night blindness is mainly caused by lack of( ).() A: Vitamin A B: Vitamin B1 C: Vitamin D D: Vitamin E

From the conversation, we know （） is very important for good eyesight. A: Vitamin A B: Vitamin B C: Vitamin C D: Vitamin D

Oranges are good fruit because they contain a lot of _____. A: vitamin A B: vitamin B C: vitamin C

Scurvy is caused by the lack of ( ). A: Vitamin A B: Vitamin D C: Vitamin C D: Sex hormones

Which kind of Vitamin is destroyed in cereals or toast when cooked with baking soda. ( ) A: Vitamin B1 B: Niacin acid C: Vitamin B12 D: Vitamin C

The main source of vitamin D in the human body is （） A: endogenous D synthesized by skin B: vitamin D in egg yolk C: vitamin D in pig liver D: vitamin D in milk

The treatment sequence for tetany of vitamin D deficiency is:( ) A: control convulsion→calcium supplement→vitamin D B: calcium supplement→control convulsion→vitamin D C: vitamin D→calcium supplement control→ convulsion D: vitamin D→control convulsion→calcium supplement

Patients with kidney stones should not take vitamin C or vitamin D.

20. Broccoli _____, can prevent the human body from being damaged by oxidant environment . A: is rich in vitamin C B: rich in vitamin C C: be rich in vitamin C D: are rich in vitamin C