单项选择题

A．Same height.
B．Same friends.
C．Same number of children.
D．Same university.
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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 ______ .
单项选择题
A．Commenting on a picture.B．Looking at some paintC．Painting a picture.D．Comparing two paintings.
A．Commenting on a picture.
B．Looking at some paint
C．Painting a picture.
D．Comparing two paintings.
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