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【单选题】

The new biotechnology procedure discussed in this passage mainly concerns ______.
A．embryos
B．pigs, sheep and goats
C．commercial science
D．improvement of animal strains

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根据网考网移动考试中心的统计，该试题：

0%的考友选择了A选项

17%的考友选择了B选项

3%的考友选择了C选项

80%的考友选择了D选项

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