2. 外语
  3. ( Found )in the (shells of) lobsters, shrimp, and crabs, glucosamine (is also) present in human cartilage, which (covering )the

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

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问题 ( Found )in the (shells of) lobsters, shrimp, and crabs, glucosamine (is also) present in human cartilage, which (covering )the bones in joints.
选项 A、Found
B、shells of
C、is also
D、covering
答案D
解析
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