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【单选题】
导致细胞分化的机制不包括哪个?A.
染色质结构的改变
B.
基因组重排
C.
基因转换
D.
基因组活性的瞬时变化
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反馈参考答案：
举一反三
【单选题】The hostess attempted to __________ a romantic atmosphere in her 10th marriage anniversary.
A.
strive
B.
contrive
C.
conceive
D.
retrieve
【单选题】With the efforts to analyze the atmosphere in the 17th and 18th century, ______ such as hydrogen were discovered which in turn led to the invention of hydrogen balloons.
A.
substances
B.
elements
C.
gases
D.
air
【简答题】Read the following passage and translate it into Chinese. The nitrogen cycle consists of a sequence of biochemical changes wherein nitrogen is used by living organisms, transformed upon death and deco...
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