【备考必备】托福官方真题Official15阅读长难句资料汇总

2016年01月21日15:34 来源：互联网: 参与（4）阅读（7619）

摘要：托福官方真题Official是考生备考托福最常用的资料，对于一些托福阅读考试中常见的长难句，也是困扰考生最大的问题。那么这些长难句应该如何去应对呢？这里为大家整理了官方真题Official阅读长难句的汇总，希望对大家的托福阅读长难句备考有帮助。

在这里小编为大家带来托福官方真题Official15阅读长难句，希望对大家提高托福阅读水平有所帮助!

托福官方真题Official15阅读长难句官方真题Official15: The Warm-Blooded Turtle

1. In a countercurrent exchange system, the blood vessels carrying cooled blood from　the flippers run close enough to the blood vessels carrying warm blood from the body to　pick up some heat from the warmer blood vessels; thus, the heat is transferred from the　outgoing to the ingoing vessels before it reaches the flipper itself.

官方真题Official15: Glacier Formation

1. When the ice is thick enough, usually over 30 meters, the weight of the snow and　firn will cause the ice crystals toward the bottom to become plastic and to flow　outward or downward from the area of snow accumulation.

2. For a glacier to grow or maintain its mass, there must be sufficient snowfall to　match or exceed the annual loss through melting, evaporation, and calving, which　occurs when the glacier loses solid chunks as icebergs to the sea or to large lakes.

3. Glaciers move slowly across the land with tremendous energy, carving into even the　hardest rock formations and thereby reshaping the landscape as they engulf, push,　drag, and finally deposit rock debris in places far from its original location.

托福官方真题Official1阅读长难句官方真题Official15: Mass Extinctions

1. Some of the proposed mechanisms required a very brief period during which all　extinctions suddenly took place; other mechanisms would be more likely to have taken　place more gradually, over an extended period, or at different times on different　continents.

2. American paleontologists David Raup and John Sepkoski, who have studied　extinction rates in a number of fossil groups, suggest that episodes of increased　　extinction have recurred periodically, approximately every 26 million years since the　mid-Cretaceous period.

3. The possibility that mass extinctions may recur periodically has given rise to such　　hypotheses as that of a companion star with a long-period orbit deflecting other bodies　from their normal orbits, making some of them fall to Earth as meteors and causing　widespread devastation upon impact.

以上就是小编为大家整理的官方真题Official15阅读长难句，希望对大家托福阅读备考有帮助。最后小编预祝大家托福考试能取得理想的成绩。