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【单选题】
（）主要是基因组 DNA上的胞嘧啶第5位碳原子和甲基间的共价结合，胞嘧啶由此被修饰为5甲基胞嘧啶
A.
DNA甲基化
B.
组蛋白修饰
C.
染色体重塑
D.
非编码RNA
E.
H4的修饰缺失
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【单选题】Passage Two In 1997, devotees of home electronics eagerly awaited the DVD player, a new device that could play movies without videotape, and with greater clarity. It caught on even faste...
A.
die economic realities of its practicality
B.
robust economic growth
C.
economic problems of hi-tech companies
D.
ignorance of the technology
相关题目：
【单选题】Passage Two In 1997, devotees of home electronics eagerly awaited the DVD player, a new device that could play movies without videotape, and with greater clarity. It caught on even faste...
A.
die economic realities of its practicality
B.
robust economic growth
C.
economic problems of hi-tech companies
D.
ignorance of the technology
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