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

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

单项选择题

The ex-president had been ______ in the country to refresh his mind before he passed away.

A．given to walking
B．given a walk
C．given for a walk
D．giving a walk