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
Postal ______ are determined by the class and weight of the parcel mailed.
A．taxes
B．payment
C．fees
D．premium
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