题目内容

Questions 4 to 7 are based on. the following conversation. At the end o f the conversation, you will be given 20 seconds to answer the questions.
Now, listen to the conversation.
Why did Tom go to live in the country？
[A] Because he liked working with children.
[B] Because he lost his job.
[C] Because he hated the city.
[D] Because he wanted to be a farmer.

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大肠杆菌染色体的分子质量大约是2.5×10⁹Da，核苷酸的平均分子质量是330Da，两个邻近核苷酸对之间的距离是0.34nm，双螺旋每一转的高度(即螺距)是3.4nm，请问：

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