单项选择题
A．stopped migrating B．continued migrating C．began migrating again D．migrated south and stay there
A．exact reasons for migration are not known B．birds migrate because of changes in temperature C．the ancestral home of all birds was the tropics D．glaciers caused birds to migrate
A．the law is not of his interest B．the law is unfavorable to him C．the law is not in favor of him D．the law is not in his honor