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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单项选择题
The field workers have handicaps in winning respect for themselves. This sentence means ______.
A．ethnologists when working in the field are handicapped
B．ethnologists have problems in winning recognition as scientists
C．ethnologists are looked down upon when they work in the field
D．ethnologists meet with lost of difficulties when doing field work
单项选择题
According to the explanation of the scientific rule of experiment in the passage, hard-and-fast means experiment procedures ______.
A．are difficult and quick to follow
B．must be carried out in a strict and quick way
C．must be followed strictly to avoid false and loose results
D．hard and unreasonable for scientists to observe
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