As skies are filled with millions of migrating birds, European scientists say the seasonal miracle appears to depend on a seeming______: The fatter the bird, the more efficiently it flies.

单项选择题The objective of this popular consultation is to determine,______, the final political status of the region, whether to remain of the country as a special district, or to part from it.

单项选择题The party leader justified his subsequent re-election______that he had brought political stability and economic development to his country.