单项选择题

The large red ants can dig as deep as ten feet to establish nests and retrieve soil for their mounds.

A．store up
B．throw out
C．bring back
D．pile up
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单项选择题
Within the bounds of given data, the biographer seeks to illuminate factual information about a person and transform it into insight.
A．concentration
B．networks
C．goals
D．constraints
单项选择题
Factors leading to the crises included poor regulation mismanagement and deception in the industry, and competition from other types of financial firms.
A．pollution
B．deceit
C．abuse
D．depression
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