单项选择题

According to the passage, scientists failed to______

A．discover the characteristic of nuclear process
B．discover the nature of uranium ore
C．save the life of uranium miners
D．store nuclear wastes in underwater tanks

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单项选择题

The best title for the passage might be______

A．Nuclear Energy and Public Safety
B．Uranium Ore and Its Characteristics
C．Scientific Approach to Disposal of Nuclear Wastes
D．Nuclear Process and Its Wastes