单项选择题

Which of the following is the least possible reason for the launching of the Manhattan Project

A．FranklinD. Roosevelt.
B．Nazi Germany.
C．Albert Einstein and other scientists.
D．The Second World War.
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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 U-235 and U-238.
单项选择题
Which one of the following that 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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