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【单选题】

Calcium is (essential) for (blood)clotting, for the action of (certain)enzymes, and for the normal contraction and (relax) of muscles.

A、essential
B．blood
C．certain
D．relax
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根据网考网移动考试中心的统计，该试题：

1%的考友选择了A选项

8%的考友选择了B选项

2%的考友选择了C选项

89%的考友选择了D选项

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