单项选择题

A．Commenting on a picture.
B．Looking at some paint
C．Painting a picture.
D．Comparing two paintings.
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Calcium permits cells to divide, regulates muscle contraction and relaxation, and plays an important role in the movement of protein and nutrients inside cells besides helping ______ .
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Calcium - rich food ______ its supplements because it also provides other nutrients like vitamin D and other minerals.
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