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1、2015 年 5 月 30 日托福阅读预测 2015 年 5 月 30 日托福阅读预测下载地址：http:/ 2015 年 5 月 30 日托福阅读预测已经免费更新啦！正在备考 2015 年 5 月 30 日托福考试或者需要托福阅读资料的考生可以进入下载地址免费索取下载使用2015年5月30日托福阅读预测!2015 年 5 月 30 日托福阅读预测部分内容：The factors that trigger migratory behavior in birds are difficult to explain.This behavior seems to be instinctive,not
2、learned.For example,many northern species leave their summer homes while the weather is still warm and the food supply plentiful.Young arctic terns born at the arctic breeding grounds will lake off with the flock for distant lands they have never seen.Bird migrations are probably regulated by the gl
3、andular system.Scientists suspect that the changing length of the day is the factor that triggers migratory behavior.In an experiment,migratory birds were kept in artificially lighted rooms.It was found that if periods of darkness were lengthened proportionately,the glands of the birds became active
4、.These glands secrete hormones,which are chemicals that control numerous body functions.Shorter periods of daylight seem to change the hormone balance of birds,so that they retain more fat.This stored fat is the fuel that provides the energy for a long flight.The same experiment revealed that the bi
5、rds became more excited as the artificial night was lengthened.It is probably no coincidence that most flocks begin their migratory flights during the night.13.According to the passage,which of the following protects birds against cold weather?(A)Glands (B)Hormones (C)Feathers (D)Artificial light 14.The word constant in line 3 is closest in meaning to (A)invariable (B)persistent (C)predictable (D)responsive 2015 年 5 月 30 日托福阅读预测下载地址：http:/