单项选择题


A．revealed
B．exposed
C．opened
D．shown
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单项选择题
A．studiedB．researchedC．surveyedD．observed
A．studied
B．researched
C．surveyed
D．observed
单项选择题
A．amongB．betweenC．inD．to
A．among
B．between
C．in
D．to
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