精选400句托福阅读长难句(OG&TPO)六
托福阅读文中，长难句也是很多同学比较困恼的内容，这些难句句型复杂，信息量比较大，如果我们不能掌握这些长难句，那么在接下来的做题中，也会面临比较大的困难。因此为大家汇总了一些比较典型的长难句，供大家参考练习。
51.Following each mass extinction, there is a sudden evolutionary burst as new species develop to fill the ecological niches opened by the event.
52.Earth is a target in a cosmic shooting gallery, subject to random violent events that were unsuspected a few decades ago.
53.Early in the century, a pump had come into use in which expanding steam raised a piston in a cylinder，and atmospheric pressure brought it down again when the steam condensed inside the cylinder to form a vacuum.
54.The final step came when steam was introduced into the cylinder to drive the piston backward as well as forward thereby increasing the speed of the engine and cutting its fuel consumption.
55.Iron manufacturers which had starved for fuel while depending on charcoal also benefited from ever-increasing supplies of coal; blast furnaces with steam- powered bellows turned out more iron and steel for the new machinery.
56.He received rudimentary village schooling but mostly he roamed his uncle's farm collecting the fossils that were so abundant in the rocks of the Cotswold hills.
57.The companies building the canals to transport coal needed surveyors to help them find the coal deposits worth mining as well as to determine the best courses for the canals.
58.In 1831 when Smith was finally recognized by the Geological Society of London as the “father of English geology”, it was not only for his maps but also for something even more important.
59.Maturation of the frontal lobes of the brain continues throughout early childhood, and this part of the brain may be critical for remembering particular episodes in ways that can be retrieved later.
60.Demonstrations of infants’ and toddlers' long-term memory have involved their repeating motor activities that they had seen or done earlier，such as reaching in the dark for objects, putting a bottle in a doll’s mouth, or pulling apart two pieces of a toy.
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