单项选择题


A．confirm
B．inform
C．claim
D．convince
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单项选择题
A．variousB．differentC．the higherD．the lower
A．various
B．different
C．the higher
D．the lower
单项选择题
A．organizationsB．organismsC．humansD．children
A．organizations
B．organisms
C．humans
D．children
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