【托福阅读】精选阅读真题长难句50句
  1、 Later experiments in which researchers played recordings of songs to young
  birds showed just how precise this influence was, many of them would learn
  the exact pattern of the recording they had heard.
  2、 The crude song of a bird reared in isolation gives some clues as to what this
  rough idea may be the length, the frequency range and the breaking up into
  notes are all aspects of chaffinch song shared between normal birds and
  those reared in isolation.
  3、 Whatever the nature of the learning rules in a particular species, there is no
  doubt that they are effective, it is very unusual to hear a wild bird singing a
  song which is not typical of its own species despite the many different songs
  which often occur in a small patch of woodland.
  4、 Chemical analysis of bones enables archaeologists to determine the
  proportion of meat to vegetable foods in the diet by measuring the proportion
  of calcium to strontium in ancient bone because strontium in place of calcium
  in bones comes primarily from ingested plants.
  5、 Each dwelling had a different arrangement of the giant bones, which came
  from the skeletons of long-dead animals retrieved from the surrounding area
  by occupants of the site, not from animals they had recently hunted.
  6、 In a precedent-setting decision, the Federal Energy Regulatory Commission
  ordered the dam removed after concluding that the environmental and
  economic benefits of a free-flowing river outweighed the electricity generated
  by the dam.
  7、 Built nearly a century ago to provide power to lumber and paper mills in the
  town of Port Angeles, these dams blocked access to upstream spawning beds
  for six species of salmon on what once was one of the most productive
  salmon rivers in the world.
  8、 The Hetch Hetchy Dam in Yosemite National Park might be taken down to
  reveal what John Muir, the founder of the prestigious environmental
  organization Sierra Club, called a valley “just as beautiful and worthy of
  preservation as the majestic Yosemite.”
  9、 A chance collision between two comets, or the gravitational influence of one
  of the Jovian planets—Jupiter, Saturn, Uranus, and Neptune—may
  occasionally alter the orbit of a comet in these regions enough to send it to
  the inner solar system and into our view.
  10、 These comets appear to be distributed in all directions from the Sun, forming
  a spherical shell around the solar system, called the Oort cloud, after the
  Dutch astronomer Jan Oort.
  11、 After the arrival of hunter-gatherers in the southwestern region of North
  America, several alternative types of agriculture emerged, all involving
  different solutions to the Southwest’s fundamental problem: how to obtain
  enough water to grow crops in an environment in which rainfall is so low and
  unpredictable that little or no farming is practiced there today.
  12、 That fate actually befell the Mimbres, who started by farming the floodplain
  and then began to farm adjacent land above the floodplain as their
  population came to exceed the floodplain’s capacity to support it.
settingsun  13、 However, when drought conditions returned, that gamble left them with a
  population double what the floodplain could support, and Mimbres society
  collapsed suddenly under the stress.
  14、 One more strategy was to plant crops at many sites even though rainfall was
  locally unpredictable and then to harvest crops at whichever sites did get
  enough rain to produce a good harvest and to redistribute some of the
  harvest to the people still living at all the sites that did not happen to receive
  enough rain that year.
  15、 Sanitation problems caused by larger, more sedentary populations would
  have helped transmit diseases in human waste, as would the use of animal
  dung for fertilizer.
  16、 The increase in many of these came not only from the fact that fewer people
  were dying from infectious disease and were living longer but also from the
  results of modern lifestyles in developed countries and among the upper
  classes of developing countries – a more sedentary life leading to less
  physical activity, more stress; environmental pollution, and high-fat diets.

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