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
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.
单项选择题
What is implied in the final, conclusive sentence
A．They succeeded in the project, although they were not sure about it.
B．They expected the project to be a great failure of the century, but it did not.
C．They concealed the project for so long that they were uncertain about it.
D．They thought the project too colossal not to be fateful as they had expecte
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