单项选择题

A．revealed
B．exposed
C．opened
D．shown
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单项选择题
A．focusesB．basesC．dependsD．takes
A．focuses
B．bases
C．depends
D．takes
单项选择题
A．studiedB．researchedC．surveyedD．observed
A．studied
B．researched
C．surveyed
D．observed
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