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

The reason for the objection to the use of the word law in modem scientific writing is that ______.

A．indicates too many commands but few statements of facts
B．conveys different meanings in human laws and Laws of Nature
C．is likely to be given wrong interpretations by law-makers
D．is not clearly defined in modem scientific writing

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