单项选择题

Which of the following did NOT cause so much trouble for the making of an atomic bomb

A．Extraction of uranium.
B．Sustentation of a reaction.
C．Conversion from uranium ore to uranium metal.
D．Separation of 1 U-235 and U-238.
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单项选择题
According to the passage, if there were 500 tons of uranium ore, how many tons of useful uranium-235 could be extracted
A．1 kilogram.
B．10 kilogram.
C．50 kilogram.
D．500 kilogram.
单项选择题
Who has been working at the making of the atomic bomb from beginning to end'
A．Albert Einstein.
B．Harold
C．Urey.C. Ernest O. Lawrence.
D．J. Robert Oppenheimer.
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