在日常学习、工作或生活中，大家总少不了接触作文或者范文吧，通过文章可以把我们那些零零散散的思想，聚集在一块。大家想知道怎么样才能写一篇比较优质的范文吗？以下是小编为大家收集的优秀范文，欢迎大家分享阅读。
托福 阅读理解真题书篇一
托福的`阅读理解对于考生来说是个不小的挑战，考生如果不仔细迎战可是很容易丢分的。下面，为大家送上一篇2017年托福考试阅读理解练习题。
according to some scientists, migratory birds should be able to withstand the winter.
a bird s feathery coat is good insulation against the cold. because a bird is warm- blooded, its body temperature always remains constant, even if the temperature of its surroundings changes.
the factors that trigger migratory behavior in birds are difficult to explain. this behavior seems to be instinctive, not 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 glandular 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. 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 birds became more excited as the artificial night was lengthened. it is probably no coincidence that most flocks begin their migratory flights during the night.
1.
(a) common migratory paths for birds
(b) why birds migrate
(c) species of birds that do not migrate
(d) migration in cold climates
(a) prefer
(b) tolerate
(c) regulate
(d) understand
(a) glands
(b) hormones
(c) feathers
(d) artificial light
(a) invariable
(b) persistent
(c) predictable
(d) responsive
(a) temperature
(b) cold
(c) coat
(d) bird
(a) do not migrate
(b) breed during migration
(c) migrate instinctively
(d) adapt to the cold
(a) glands
(b) birds
(c) body functions
(d) hormones
(a) activated glands
(b) excited behavior
(c) retention of more fat
(d) increased appetite
(a) food supply
(b) body temperatures
(c) exposure to light
(d) brain chemistry
(a) lines 2-4
(b) lines 5-7
(c) lines 10-11
(d) lines 16-17
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