单项选择题


A．through
B．by
C．in
D．across
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单项选择题
A．meansB．waysC．sourcesD．resource
A．means
B．ways
C．sources
D．resource
单项选择题
The word cumulative in Paragraph 1 most probably means ______.
A．decisive
B．extremely beneficial
C．strong
D．progressively greater
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