单项选择题

In the first sentence, the word "laymen", means ______.

A．people who stand aside
B．people who are not trained as biologists
C．people who are amateur biologists
D．people who love animals
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单项选择题
According to the passage, ethnology is ______.
A．a new branch of biology
B．an old Greek science
C．a pseudo-science
D．a science for amateurs
单项选择题
The meaning of the underlined words in the details of spontaneous family relationships can be expressed as ______.
A．natural family relationships
B．quickly occurring family relationships
C．animals acting like a natural family
D．animal family behavior that cannot be preplanned or controlled
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