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crossing
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单项选择题
A．Sperm, cells, DNA and other genes.B．Sperm, cells, DNA and other products.C．Sperm, organs, DNA and other genes.D．Sperm, organs, DNA and other products.
A．Sperm, cells, DNA and other genes.
B．Sperm, cells, DNA and other products.
C．Sperm, organs, DNA and other genes.
D．Sperm, organs, DNA and other products.
填空题
H
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