单项选择题

The main topic of this passage is that ______.

A．the name "A Law of Nature" is not quite adequate
B．Laws of Nature have a lot of practical and theoretical value
C．Laws of Nature do not always accurately state the nature of matters
D．"law" has two different meanings

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单项选择题

According to the passage, in primitive societies, ______.

A．custom was regarded as a part of the law
B．distinction was made between law and custom
C．changes in custom could hardly be noticed
D．a law was altered with the changes of custom

单项选择题

It can be inferred from the passage that ______.

A．the Apollo mission was very successful
B．protection from space radiation is no easy job
C．astronauts will have deformed children or grandchildren
D．radiation is not a threat to well-protected space explorers