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

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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 Characteristic
C．Scientific Approach to Dispose of Nuclear Wastes
D．Nuclear Process and Its Wastes

单项选择题

What does a man do when he cannot get exactly what he wants

A．So long as the style is right, he buys the things.
B．He usually does not buy anything.
C．He will try on some substitutes.
D．He will make up his mind after looking around.