2. 外语
  3. According to one of the theory, when glaciers disappeared, birds______. According to the theory of the photoperiodism,______.

According to one of the theory, when glaciers disappeared, birds______. According to the theory of the photoperiodism,______.

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问题 According to one of the theory, when glaciers disappeared, birds______.
According to the theory of the photoperiodism,______.
选项 A、birds should migrate in the middle of the winter
B、there were too many glaciers
C、longer days cause changes in the bodies of birds
D、increasing daylight increases the distance of migration
答案C
解析 第三段提到一位科学家对鸟进行阳光反应试验，得出的结论是：鸟的体内随着不同季节光照时间的变化而发生变化。所以说白天长导致鸟体内变化是正确的。
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