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【单选题】

( Found )in the (shells of) lobsters, shrimp, and crabs, glucosamine (is also)_ present in human cartilage, which (covering )the bones in joints.
A．Found

B．shells of
C．is also
D．covering
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根据网考网移动考试中心的统计，该试题：

30%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

60%的考友选择了D选项

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