对于地理学的托福浏览习题

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对于地理学的托福浏览习题

　　在托福测验中，地理学科也历来都是被重点考查的学科之一。上面是小编清算的两道对于地理学的托福浏览习题，但愿对大师有效，更多动静请存眷应届毕业生网。

对于地理学的托福浏览习题

　　第一道标题问题来自于TPO 8 Running Water on Mars

　　Paragraph 2: Outflow channels are probably relics of catastrophic flooding on Mars long ago. They appear only in equatorial regions and generally do not form extensive interconnected networks. Instead, they are probably the paths taken by huge volumes of water draining from the southern highlands into the northern plains. The onrushing water arising from these flash floods likely also formed the odd teardrop-shaped “islands” (resembling the miniature versions seen in the wet sand of our beaches at low tide) that have been found on the plains close to the ends of the outflow channels. Judging from the width and depth of the channels, the flow rates must have been truly enormous-perhaps as much as a hundred times greater than the 105 tons per second carried by the great Amazon river. Flooding shaped the outflow channels approximately 3 billion years ago, about the same times as the northern volcanic plains formed.

　　Question: According to paragraph 2, all of the following are true of the outflow channels on Mars EXCEPT:

　　A. They formed at around the same time that volcanic activity was occurring on the northern plains.

　　B. They are found only on certain parts of the Martian surface.

　　C. They sometimes empty onto what appear to have once been the wet sands of tidal beaches.

　　D. They are thought to have carried water northward from the equatorial regions.

　　分解：题干问的是原文对于“outflow channels”的描写。在真正测验中，把原文浏览终了再去和选项比拟会破费较多时辰。是以，比拟公道的做题挨次是，先读选项，而后拿选项和原文信息去比对。

　　A选项说的是outflow channel的构成时辰和火山勾当在北部平原的产生时辰是不异的。疾速浏览原文，只要在最初一句提到了它们的构成时辰，说大要在30亿年前，about指导的时辰状语很重要，补充说了然这一时辰和北部火山平原构成的时辰不异。A准确。

　　B选项说的是火山构成的地址，只在火星外表的特定地区。看原文，第二句，说的是它们只在赤道地区呈现。B也准确。

　　C选项说的是它们偶然候会流到曾的湿沙地上。原文在提到tidal beaches时，并不提到这一信息，是以，C选项是不合适原文的。

　　D选项说的是河水从赤道(南)向北活动。和原文第三句话符合：这些河道的走向是从南部凹凸到北部平原。

　　是以，本题的准确谜底为C项。

　　第二道标题问题来自于 TPO 16 Planets in Our Solar System

　　Paragraph 4: Other dimensions along which the two groups differ markedly are density and composition. The densities of the terrestrial planets average about 5 times the density of water, whereas the Jovian planets have densities that average only 1.5 times the density of water. One of the outer planets, Saturn, has a density of only 0.7 that of water, which means that Saturn would float in water. Variations in the composition of the planets are largely responsible for the density differences. The substances that make up both group of planets are divided into three groups-gases, rocks, and ices-based on their melting points. The terrestrial planets are mostly rocks: dense rocky and metallic material, with minor amounts of gases. The Jovian planets, on the other hand, contain a large percentage of the gases hydrogen and helium, with varying amounts of ices: mostly water, ammonia, and methane ices.

　　Question: Paragraph 4 mentions which of the following as a reason why terrestrial planets are dense?

　　A. They are made up of three groups of substances.

　　B. They are composed mainly of rocky and metallic materials.

　　C. They contain more ice than Jovian planets.

　　D. They contain relatively small amounts of water.

　　分解：题干问的是类地行星密度较大的缘由。那我们只要将做题重点锁定在原文描写“density”的信息上便可。原文中含有density的句子，第一句在说类地行星的密度和其余行星的密度比。第二句说的是土星密度。第三句说到行星布局的差别影响着密度的差别。前面进一步阐释构成行星的物资：气体，岩石和冰。接着又提到类地行星首要由岩石构成。明显，这便是它密度大的缘由。综合比拟，应当选B。

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地理学的托福浏览习题