Certain growth factors spur stem cells to （ ） into specific kinds of cells, such as bone or muscle. ( 章节：1 难度：4)
- A、grow
- B、move
- C、morph
- D、change
正确答案:C
答案解析:有
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Certain growth factors spur stem cells to （ ） into specific kinds of cells, such as bone or muscle. ( 章节：1 难度：4)
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