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
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单项选择题
The possible mason for hundreds of airport employees being arrested might be one of the following except ______.
A．using false ID
B．helping others in smuggling
C．being in the US illegally
D．denying or not mentioning past crimes
单项选择题
What do we learn about deserts from this text
A．Deserts can change into green and fertile areas.
B．Certain areas have always been desert.
C．Deserts were once the home of elephants and giraffes.
D．Deserts have been growing since the beginning of the world.
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