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搜题
【单选题】
细胞周期运行的原动力是A.
A . 周期性基因表达；
B.
周期性蛋白质磷酸化；
C.
生长因子；
D.
细胞周期检查点；
E.
周期性蛋白质降解
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知识点：
皮皮学刷刷变学霸
举一反三
【简答题】保证单向流洁净室先决条件有两个: 、 。
【单选题】The boy watched the television special the night before the test but he didn't really enjoy it because ______.
A.
the television special was not interesting
B.
he didn't want to watch TV
C.
he was upset that he had not told the truth to his father
D.
the television special began too late