| 1 | Vitamin A deficiency can lead to children becoming prematurely blind. | |
| 2 | Iodine deficiency can easily be prevented at low cost. | |
| 3 | Have you ever known anyone with a protein deficiency? | |
| 4 | Many children in the poor area had calcium deficiency. | |
| 5 | A: Iodine deficiency is the main cause of brain damage in childhood. |
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