单项选择题

The best title for the passage might be______.

A．Nuclear Energy and Public Safety
B．Uranium Ore and Its Characteristic
C．Scientific Approach to Dispose of Nuclear Wastes
D．Nuclear Process and Its Wastes
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单项选择题
According to 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
单项选择题
It is implied in the passage that the primary difficulty in seeking a safe way to dispose of nuclear wastes is caused by______.
A．the nuclear process involving the danger of radioactivity at its every stage
B．fuel for nuclear reactors producing dangerous wastes
C．the weakness scientists have found in every previous methods
D．the nature of nuclear wastes together with their lengthy life span
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