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【单选题】

(As do) all insects, a butterfly has a hard (outer) covering, (called it) an exoskeleton, (that both) supports and protects the body.
A．As do

B．outer
C．called it
D．that both
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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

5%的考友选择了B选项

69%的考友选择了C选项

25%的考友选择了D选项

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