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.

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单项选择题

A． office hierarchiesB．office conditionsC．office rulesD．office life

A． office hierarchies
B．office conditions
C．office rules
D．office life

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.