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提问人：网友陈珊发布时间：2022-05-14

[单选题]

Grafting of a second polarizing region into the anterior region of a limb bud results

A.formation of additional digits in mirror symmetry with the nor mal digits

B.formation of a second limb bud at the site of the graft

C.formation of new digits that lack any specific identity

D.formation of new digits, but only those of anterior identity

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· 有4位网友选择 D，占比44.44%
· 有3位网友选择 A，占比33.33%
· 有1位网友选择 C，占比11.11%
· 有1位网友选择 B，占比11.11%

ABCD

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