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

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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

单项选择题

The best title for this passage would be ______.

A．The Atmosphere and Our Environment
B．Research on Radiation
C．Effects of Space Radiation
D．Importance of Protection Against Radiation