听力原文:M: Why did you get up at 6:30?. I thought your meeting wasn't until 10:30. W: I wanted to visit the park before I left. It' s the first time I've seen it. How much time did she have her meeting?
A.
4 hours.
B.
6 hours.
C.
10 hours.
D.
1 hour.
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举一反三
【单选题】Northern印迹杂交可以用于
A.
快速确定是否存在目的基因
B.
不仅可以检测 DNA 样品中是否存在某一特定的基因,而且还可以获得基因片段的大小及酶切位点分布的信息