单项选择题

What is the passage mainly about

A．How biochemical changes occur in the human brain.
B．Why people should keep active not only physically but also mentally.
C．How intellectual activities influence brain-cell health.
D．Why people should receive special mental training as they age.
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单项选择题
The most appropriate title for this passage would be ______.
A．Self-education
B．Objects in Education
C．Ways of Developing Oneself
D．Sources of Receiving Education
单项选择题
According to the passage, to develop oneself is all of the following except ______.
A．having a better memory
B．acquiring an education
C．improving the ability to judge correctly
D．improving your reasoning abilities
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