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
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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
单项选择题
What is a terrible tool for activities such as sketching and painting
A．Technology
B．Typewriter
C．Text
D．The web
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