()依法对证券公司债券的发行和转让行为进行监督管理。
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PPL scientists will try to solve their problem by
[A] removing the sugar molecule on the surface of pig cells.
[B] distinguishing human tissues form. those of pigs.
[C] using the sugar-free nucleus in cloning a pig.
[D] taking out the sugar genes from the cell of a pig.