单项选择题

When was the firm foundation of quantum theory laid

A．In 1913.
B．In 1924.
C．In 1925.
D．In 1927.
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单项选择题
Heisenberg did not leave Germany during the Second World War because he ________.
A．supported the Nazi regime
B．wanted to contribute to the German physics
C．was not sympathetic for the Nazi regime
D．wanted to develop a nuclear reactor in Germany
单项选择题
Where does this article probably occur
A．A magazine.
B．A physics textbook.
C．A physics report.
D．A government document.
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