单项选择题

A．The need to control population both in those underdeveloped countries and in developed countries.
B．How to control population in Europe.
C．Scarcity of food and other resources in the world.
D．Population and environment.
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单项选择题
The functions of FBI are the following except ______.
A．to investigate threats to security of the United States that take place within the U.S. borders
B．to stop the spread of communism in Central and South America
C．to protect the president and vice-president
D．to coordinate intelligence operations
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