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根据下列材料回答下列各题。
Passage Two

Although no one is certain why migration occurs，there are several theories．One theory isbased upon the premise that prehistoric birds of the northen Hemisphere were forced southDur-ing the Ice Age，when glaciers covered large parts of Europe，Asia，and Nor
Another theory proposes that the ancestral home of all modem birds was the tropics．Whenthe region became overpopulated，many species were crowded north．During the summer，therewas plenty of food，but During the winter，scarcity forced them to retum to the
A more recent theory，known as photoperiodism，suggests a relationship between increasingday light and the stimulation of certain glands in the birds’bodies that may prepare them for mi—gration．One scientist has been able to cause midwinter migrations
According to one theory，when the glaciers Disappeared，birds_________．
A.stopped migrating
B.continued migrating
C.began migrating again
D.migrated south and stay there

试题出自试卷《成人高考专升本《英语》全真模拟试卷(5)》

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