1. Although no one is certain why m

1. Although no one is certain why migration occurs, there are several theories. One theory claims that prehistoric birds of the Northern Hemisphere were forced south during the Ice Age. As the glaciers melted, the birds came back to their homelands, spent the summer, and then went south again as the ice advanced in winter. In time, the migration became a habit in spite of the disappearance of glaciers. Another theory proposes that the ancestral home of all modern birds was the tropics. When the region became overpopulated, many species were crowded north. During the summer, there was plenty of food, but during the winter, scarcity forced them to return to the tropics. A more recent theory suggests a relationship between increasing daylight and the stimulation of certain glands (腺) in the birds' bodies that may prepare them for migration. One scientist has been able to cause midwinter migrations by exposing birds to artificial periods of daylight. He has concluded that changes occur in the bodies of birds due to seasonal changes in the length of daylight. 1. According to one theory, when the glaciers disappeared, birds______. A. stopped migratingB. continued migratingC. stayed in the northD. migrated south and stayed there

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1.虽然没有一个是肯定的，为什么迁移时，有几种说法。有一种理论声称，北半球的史前鸟类是在冰河时期南方被迫的。随着冰川融化，鸟儿回到自己的家园，度过了夏天，然后再南下来到的冰在冬天提前。随着时间的推移，迁移成了尽管冰川消失的习惯。 另一种理论认为，所有现代鸟类的祖籍热带地区。当成为该地区人口过多，许多物种都挤北部。在夏季，有充足的食物，但在冬季，稀缺迫使他们返回到热带地区。 最近的一个理论认为，增加采光和某些腺（腺）在鸟类的身体可能准备迁移他们的刺激之间的关系。一位科学家已经能够通过暴露鸟日光的人工周期造成隆冬迁移。他的结论是，由于白天的长度季节性变化出现在鸟类的身体变化。 1.根据一个理论，当冰川消失，birds______。 A.停止迁移 B.继续迁移 C.住在北 D.向南迁移并在那里呆了

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结果 (简体中文) 2:[复制]

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1. Although no one is certain why migration occurs, there are several theories. One theory claims that prehistoric birds of the Northern Hemisphere were forced south during the Ice Age. As the glaciers melted, the birds came back to their homelands, spent the summer, and then went south again as the ice advanced in winter. In time, the migration became a habit in spite of the disappearance of glaciers. Another theory proposes that the ancestral home of all modern birds was the tropics. When the region became overpopulated, many species were crowded north. During the summer, there was plenty of food, but during the winter, scarcity forced them to return to the tropics. A more recent theory suggests a relationship between increasing daylight and the stimulation of certain glands (腺) in the birds' bodies that may prepare them for migration. One scientist has been able to cause midwinter migrations by exposing birds to artificial periods of daylight. He has concluded that changes occur in the bodies of birds due to seasonal changes in the length of daylight. 1. According to one theory, when the glaciers disappeared, birds______. A. stopped migrating B. continued migrating C. stayed in the north D. migrated south and stayed there

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结果 (简体中文) 3:[复制]

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一。虽然没有人确定为什么会发生迁移，但有几种理论。有一种理论认为，在冰河时期，北半球的史前鸟类被迫向南迁徙。随着冰川融化，鸟儿们回到了自己的家园，度过了一个夏天，然后随着冬天冰层的推进再次向南移动。随着时间的推移，尽管冰川消失了，但迁徙已经成为一种习惯。 另一种理论认为，所有现代鸟类的祖籍地都是热带地区。当这个地区人口过剩时，许多物种都聚集在北方。在夏天，有很多食物，但在冬天，匮乏迫使他们返回热带。 最近的一个理论表明，白天的增加与鸟体内某些腺体（ೲ）的刺激之间的关系，这些腺体可能为它们的迁徙做准备。一位科学家通过让鸟类暴露在人工日光下，已经能够引起仲冬迁徙。他得出的结论是，由于日照时间的季节性变化，鸟类的身体会发生变化。 一。根据一种理论，当冰川消失时，鸟类就消失了。 A、停止迁移 B、继续迁移 C、留在北方 D、向南迁移并留在那里

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