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1、【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 youngbirds showed just how precise this in flue nee was, many of them would learnthe exact patter n of the record ing they had heard.2、The crude song of a bird reared in isolation gives some clues as to what th
2、isrough idea may be the len gth, the freque ncy range and the break ing up intono tes are all aspects of chaffi nch song shared betwee n no rmal birds andthose reared in isolati on.3、Whatever the nature of the learning rules in a particular species, there is nodoubt that they are effective, it is ve
3、ry unusual to hear a wild bird singing asong which is not typical of its own species despite the manydifferent songswhich ofte n occur in a small patch of woodla nd.4、Chemical analysis of bones enables archaeologists to determine theproportion of meat to vegetable foods in the diet by measuring the
4、proporti onof calcium to strontium in ancient bone because strontium in place of calciumin bones comes primarily from ingested plants.5、Each dwelling had a differentarrangement of the giant bones, which camefrom the skelet ons of Ion g-dead ani mals retrieved from the surro unding areaby occupants o
5、f the site, not from animals they had recently hunted.6、In a precede nt-setti ng decisi on, the Federal En ergy Regulatory Commissio nordered the dam removed after con cludi ng that the en vir onmen tal andecono mic ben efits of a free-flow ing river outweighed the electricity gen eratedby the dam.7
6、、Built n early a cen tury ago to provide power to lumber and papermills in thetown of Port Angeles, these damsblocked access to upstream spawning bedsfor six species of salmon on what once was one of the most productivesalm on rivers in the world.8、 The Hetch Hetchy Damn Yosemite National Park might
7、 be taken down toreveal what Joh n Muir, the foun der of the prestigious en vir onmen talorga ni zati on Sierra Club, called a valley“ just as beautiful andworthy ofpreservatio n as the maj estic Yosemite. ”9、A chanee collision between two comets, or the gravitational in flue nee of oneof the Jovia
8、n pla netsJupiter, Satur n, Uranus, and Nept unemayoccasi on ally alter the orbit of a comet in these regi ons eno ugh to send it tothe inner solar system and into our view.10、These comets appear to be distributed in all directionsfrom theSun, formi nga spherical shell around the solar system, calle
9、d the Oort cloud, after theDutch astro no mer Jan Oort.11、 After the arrival of hunter-gatherersin the southwestern region of NorthAmerica, several alter native types of agriculture emerged, allinv olvi ngdiffere nt soluti ons to the Southwest s fun dame ntal problem: how toobtai neno ugh water to g
10、row crops in an en vir onment in which rain fall issolow andunpredictable that little or no farming is practiced there today.12、That fate actually befell the Mimbres, who started by farmi ng the floodpla inand the n bega n to farm adjace nt land above the floodpla in as theirpopulation ca me to exce
11、ed the floodplain s capacity to support it.13、 However, whendrought conditions returned, that gamble left them with apopulati on double what the floodpla in could support, and Mimbres societycollapsed sudde nly un der the stress.14、One more strategy was to pla nt crops at many sites eve n though rai
12、n fall waslocally un predictable and the n to harvest crops at whichever sites did geteno ugh rain to produce a good harvest and to redistribute someof theharvest to the people still living at all the sites that did not happen to receiveeno ugh rain that year.15、 Sanitationproblems caused by larger,
13、 more sedentary populations wouldhave helped transmit diseases in human waste, as would the use of an imaldung for fertilizer.16、The in crease in many of these came not only from the fact that fewer peoplewere dying from in fectious disease and were livi ng Ion ger but also from theresults of moder
14、n lifestyles in developed coun tries and among the upperclasses of developing countries - a more sedentary life leading to lessphysical activity, more stress; en vir onmen tal polluti on, and high-fat diets.17、This evolution mayhave been encouraged by what someauthorities con siderour overuse of an
15、tibiotics, giving microorga ni sms a greater cha nee to evolveresista nee by expos ing them to a con sta nt barrage of selective challe nges.18、Therefore, on many reefs it is the fast-growi ng, bran chi ng corals thatultimately domin ate at the upper, shallower porti on of the reef, whereasmore massive forms domin ate in deeper areas.19、The fact that almost all small invertebrateson reefs are so wellhidde n orhighly camouflaged is ano ther in dicator of how prevale nt predati on is onreefs and its importa nee in determ ining reef structure.20、Fin ally, they n eed reliable methods of storage b
