单项选择题

What does the word mind-stretching imply

A．Obtaining one's mental power.
B．Strengthening one's power of thought.
C．Making great demands on one's mental power.
D．Exerting one's mental power as far as possibl

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单项选择题

A．Obtaining one's mental power.
B．Strengthening one's power of thought.
C．Making great demands on one's mental power.
D．Exerting one's mental power as far as possibl

单项选择题

Which group of people make some efforts to help pupils in elementary schools

A．Teachers
B．Researchers
C．Grandparents
D．Senior citizens