单项选择题

A．ballet.
B．Swimming.
C．Nursing.
D．Teaching
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单项选择题
A．Same height.B．Same friends.C．Same number of children.D．Same university.
A．Same height.
B．Same friends.
C．Same number of children.
D．Same university.
填空题
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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