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托福阅读句子插入题练习(2)

2015-08-07 15:42:07来源：网络

　　【托福阅读句子插入题练习(2)】本文中托福阅读题型句子插入题范例及材料由新东方在线名师提供。新东方在线托福网为大家带来托福阅读句子插入题练习(2)，希望对大家托福备考有所帮助。更多精彩尽请关注新东方在线托福网!

　　查看全部：托福阅读不同题型练习汇总

　　例一：Under very cold conditions, rocks can be shattered by ice and frost. Glaciers may　cut out valleys, carrying with them huge quantities of eroded rock debris. █ In dry areas　　the wind is the principal agent of erosion. █ It carries fine particles of sand, which　bombard exposed rock surfaces, thereby wearing them into yet more sand. █ Even living　things contribute to the formation of landscapes. █Tree roots force their way into cracks in　rocks and, in so doing, speed their splitting.

　　Under different climatic conditions, another type of destructive force contributes to　erosion.

　　例二：

　　The subjects of the paintings are mostly animals. The paintings rest on bare walls, with no　backdrops or environmental trappings. Perhaps, like many contemporary peoples, Upper　Paleolithic men and women believed that the drawing of a human image could cause　　death of injury, and if that were indeed their belief, it might explain why human figures are　rarely depicted in cave art. Another explanation for the focus on animals might be that　these people sought to improve their luck at hunting.█ This theory is suggested by　evidence of chips in the painted figures, perhaps made by spears thrown at the drawings.　█ But if improving their hunting luck was the chief motivation for the paintings, it is difficult　to explain why only a few show signs of having been speared. █ Perhaps the paintings　were inspired by the need to increase the supply of animals. Cave art seems to have　reached a peak toward the end of the Upper Paleolithic period, when the herds of game　were decreasing. █

　　Therefore, if the paintings were connected with hunting, some other explanation is　needed.

　　例三：Scientists have known for some time that certain plants, called hyper accumulators,　can concentrate minerals at levels a hundredfold or greater than normal. █ A survey of　known hyper accumulators identified that 75 percent of them amassed nickel, cobalt,copper, zinc, manganese, lead, and cadmium are other minerals of choice. █Hyperaccumulators run the entire range of the plant world. █ They may be herbs, shrubs, or　trees. █ Many members of the mustard family, spurge family, legume family, and grass　family are top hyper accumulators. Many are found in tropical and subtropical areas of the　metals may afford some protection against plant-eating insects and microbial pathogens.

　　Certain minerals are more likely to be accumulated in large quantities than others.


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