In maintaining that migrating animals would need "a fantastic map sense" to determine thei

In maintaining that migrating animals would need "a fantastic map sense" to determine their geographic position by celestial navigation, the author intends to express ______.

A．admiration for the ability of the migrants

B．skepticism about celestial navigation as an explanation

C．certainty that the phenomenon of migration will remain mysterious

D．interest in a new method of accounting for over-water migration

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