单项选择题

Ricci is compared to Columbus in the passage mainly because

A．they both benefited from Italian sponsors.
B．they were explorers in their own ways.
C．they obtained overseas sponsorship.
D．they got a warm reception in America.

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单项选择题

Which of the following statements is INCORRECT

A．Migration exerts a great impact on population change.
B．Migration contributes to mankind's progress.
C．Migration brings about desirable and undesirable effects.
D．Migration may not be accompanied by human conflicts.