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

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

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

单项选择题

The expression scratch the surface most probably means ______.

A．think hard in a puzzled way
B．deal with a problem thoroughly
C．treat a subject without being thorough
D．work out a solution for a problem easily