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1、 为了帮助大家高效备考托福，为大家带来托福 TPO8 阅读 Passage3 原文文本+题目+答案 解析，希望对大家备考有所帮助。 托福 TPO8 阅读 Passage3 原文文本： Running Water on Mars Photographic evidence suggests that liquid water once existed in great quantity on the surface of Mars. Two types of flow features are seen: runoff channels and outflow channels. Runoff
2、channels are found in the southern highlands. These flow features are extensive systemssometimes hundreds of kilometers in total lengthof interconnecting, twisting channels that seem to mergeinto larger, wider channels. They bear a strong resemblance to river systems on Earth, and geologists think t
3、hat they are dried-up beds of long-gone rivers that once carried rainfall on Mars from the mountains down into the valleys. Runoff channels on Mars speak of a time 4 billion years ago (the age of the Martian highlands), when the atmosphere was thicker, the surface warmer, and liquid water widespread
4、. 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 nort
5、hern 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 wid
6、th and depth of the channels, the flow rates must have been truly enormousperhaps 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 p
7、lains formed. Some scientists speculate that Mars may have enjoyed an extended early Period during which rivers, lakes, and perhaps even oceans adorned its surface. A 2003 Mars Global Surveyor image shows what mission specialists think may be a deltaa fan- shaped network of channels and sediments wh
8、ere a river once flowed into a larger body of water, in this case a lake filling a crater in the southern highlands. Other researchers go even further, suggesting that the data provide evidence for large open expenses of water on the early Martian surface. A computer-generated view of the Martian no
9、rth polar region shows the extent of what may have been an ancient ocean covering much of the northern lowlands. The Hellas Basin, which measures some 3,000 kilometers across and has a floor that lies nearly 9 kilometers below the basin s rim, is another candidate for an ancient Martian sea. These i
10、deas remain controversial. Proponents point to features such as the terraced “beaches” shown in one image, which could conceivably have been left behind as a lake or ocean evaporated and the shoreline receded. But detractors maintain that the terraces could also have been created by geological activ
11、ity, perhaps related to the geologic forces that depressed the Northern Hemisphere far below the level of the south, in which case they have nothing whatever to do with Martian water. Furthermore, Mars Global Surveyor data released in 2003 seem to indicate that the Martian surface contains too few c
12、arbonate rock layerslayers containing compounds of carbon and oxygenthat should have been formed in abundance in an ancient ocean. Their absence supports the picture of a cold, dry Mars that never experienced the extended mild period required to form lakes and oceans. However, more recent data imply
13、 that at least some parts of the planet did in fact experience long periods in the past during which liquid water existed on the surface. Aside from some small-scale gullies (channels) found since 2000, which are inconclusive, astronomers have no direct evidence for liquid water anywhere on the surf
14、ace of Mars today, and the amount of water vapor in the Martian atmosphere is tiny. Yet even setting aside the unproven hints of ancient oceans, the extent of the outflow channels suggests that a huge total volume of water existed on Mars in the past. Where did all the water go? The answer may be th
15、at virtually all the water on Mars is now locked in the permafrost layer under the surface, with more contained in the planets polar caps. 托福 TPO8 阅读 Passage3 题目： Question 1 of 13 The word “merge ” in the passage is closest in meaning to A. expand B. separate C. straighten out D. combine Question 2
16、of 13 What does the discussion in paragraph 1 of runoff channels in the southern highlands suggest about Mars? A. The atmosphere of Mars was once thinner than it is today. B. Large amounts of rain once fell on parts of Mars. C. The river systems of Mars were once more extensive than Earths. D. The r
17、ivers of Mars began to dry up about 4 billion years ago. Question 3 of 13 The word “relics ” in the passage is closest in meaning to A. remains B. sites C. requirements D. sources Question 4 of 13 The word “miniature ” in the passage is closest in meaning to A. temporary B. small C. multiple D. fami
18、liar Question 5 of 13 In paragraph 2, why does the author include the information that 105 tons of water flow through the Amazon river per second? A. To emphasize the great size of the volume of water that seems to have flowed through Mars outflow channels B. To indicate data used by scientists to e
19、stimate how long ago Mars outflow channels were formed C. To argue that flash floods on Mars may have been powerful enough to cause tear- shaped “islands” to form D. To argue that the force of flood waters on Mars was powerful enough to shape the northern volcanic plains Question 6 of 13 According t
20、o 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 on
21、ce been the wet sands of tidal beaches. D. They are thought to have carried water northward from the equatorial regions. Question 7 of 13 All of the following questions about geological features on Mars are answered in paragraph 3 EXCEPT: A. What are some regions of Mars that may have once been cove
22、red with an ocean? B. Where do mission scientists believe that the river forming the delta emptied? C. Approximately how many craters on Mars do mission scientists believe may once have been lakes filled with water? D. During what period of Mars history do some scientists think it may have had large
23、 bodies of water? Question 8 of 13 According to paragraph 3, images of Mars surface have been interpreted as support for the idea that A. the polar regions of Mars were once more extensive than they are now B. a large part of the northern lowlands may once have been under water C. deltas were once a
24、 common feature of the Martian landscape D. the shape of the Hellas Basin has changed considerably over time Question 9 of 13 Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or le
25、ave out essential information. A. But detractors argue that geological activity may be responsible for the water associated with the terraces. B. But detractors argue that the terraces may have been formed by geological activity rather than by the presence of water. C. But detractors argue that the
26、terraces may be related to geological forces in the Northern Hemisphere of Mars, rather than to Martian water in the south. D. But detractors argue that geological forces depressed the Northern Hemisphere so far below the level of the south that the terraces could not have been formed by water. Ques
27、tion 10 of 13 According to paragraph 4, what do the 2003 Global Surveyor data suggest about Mars? A. Ancient oceans on Mars contained only small amounts of carbon. B. The climate of Mars may not have been suitable for the formation of large bodies of water. C. Liquid water may have existed on some p
28、arts of Mars surface for long periods of time. D. The ancient oceans that formed on Mars dried up during periods of cold, dry weather. Question 11 of 13 The word “hints ” in the passage is closest in meaning to A. clues B. features C. arguments D. effects Question 12 of 13 Look at the four squares t
29、hat indicate where the following sentence could be added to the passage. Where would the sentence best fit? These landscape features differ from runoff channels in a number of ways Question 13 of 13 Directions: An introductory sentence for a brief summary of the passage is provided below. Complete t
30、he summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points. There is much debate conce
31、rning whether Mars once had water. A.Mars runoff and outflow channels are large-scale, distinctive features that suggest that large quantities of liquid water once flowed on Mars. B.Although some researchers claim that Mars may once have had oceans, others dispute this, pointing to an absence of evi
32、dence or offering alternative interpretations of evidence. C.Various types of images have been used to demonstrate that most of Martian surface contains evidence of flowing water. D.The runoff and outflow channels of Mars apparently carried a higher volume of water and formed more extensive networks
33、 than do Earths river systems. E.There is very little evidence of liquid water on Mars today, and it is assumed that all the water that once existed on the planet is frozen beneath its surface. F.While numerous gullies have been discovered on Mars since 2000, many astronomers dismiss them as evidenc
34、e that Mars once had liquid water. 托福 TPO8 阅读 Passage3 答案解析： Question 1 of 13 正确答案：D 题目解析： merge: 合并。A 是扩张;B 是分开;C 是改正，扯平;D 是结合。所以 D 的 combine 正确。 对 应 原 文 ： These flow features are extensive systems-sometimes hundreds of kilometers in total length-of interconnecting, twisting channels that seem to m
35、erge into larger, wider channels. 原句说那些 interconnecting 的，twisting 的 channel 怎么 样成为大的更宽的 channel，merge 应该有变大之意。expand 和 combine 可能正确，具体哪 个对只能靠认识了。 Question 2 of 13 正确答案：B 题目解析： B 以 runoff channels 和 southern highlands 做关键词定位至第三句， 但问题问的是表 明了什么，关键词所在句明显没说，接着本段又说了一大堆这种 channel 的特点，直到最后 一句才说 speak of bl
36、abla，答案在最后一句，B 正确;A 和 D 说反了;C 没说。 Question 3 of 13 正确答案：A 题目解析： A, relics: 遗迹， 残余。 A 是残余;B 是遗址;C 是要求;D 是资源。 所以 A 的 remains 正确。 Question 4 of 13 正确答案：B 题目解析： B miniature: 小型的，缩略图，小模型，所以 B 的 small 正确。先看单词本身，前半部 分是个 mini， 就是小的意思， 迷你， 所以会猜到跟小相关。 A 是暂时的;C 是多重的， 多样的;D 是熟悉的。 Question 5 of 13 正确答案：A 题目解析： A
37、 修辞目的题， 往前看， 本句修词点之前有破折号， 证明这个 105 ton 是解释前面内容的。 之前说那些 channel 的水流量非常大，然后马上出现了一个 105 ton 的例子，所以答案是 A。 Question 6 of 13 正确答案：C 题目解析： C EXCEPT 题， 排除法。 A 的 volcanic activity 做关键词定位至最后一句， 正确， 不 选;B 的 certain parts 与原文第二句的 equatorial regions 同义重合，正确，不选;C 的 beaches 做关键词定位至倒数第三句，但原文说洪水形成的小岛形状像海滩上的沙子，跟 C 说的
38、不同，所以 C 错，选;D 的 northward 做关键词定位至第三句，再结合第二句，说明 D 正 确，不选。 Question 7 of 13 正确答案：C 题目解析： D EXCEPT 题，排除法。A 的 regions 做关键词定位至第二句的后半部分和倒数第二句， 正确，不选;B 的 delta 做关键词定位至原文第二句，正确，不选;C 的 craters 做关键词定位 至第二句，但原文只说有 crater 被填满，没说几个，所以 C 错，选;D 的 large bodies of water 与原文第一句的 rivers, lakes and even oceans 同义重合，正确，
39、不选。 Question 8 of 13 正确答案：B 题目解析： D 排除法。A 的 polar 做关键词定位至倒数第二句，原文没说比现在更 extensive，错， 不选;同时这句话说北部的 lowland 可能是个 ancient ocean， 与 B 选项说的在水下是同义重 现，所以 B 正确，选;C 的 deltas 做关键词定位至第二句，原文没说 common，错，不选;D 的 专有名词定位至最后一句，没说变化，错，不选。 Question 9 of 13 正确答案：B 题目解析： B从句套并列句， 原句说detractors认为terrace是由地质活动， 而非水的原因形成的。
40、A 错， 水和地质活动是对等的两面， 不是因果关系;B 正确;C 的 southern 和 northern 偷换原文 概念， 内容乱拼， 错;D 与 A 的错误类似， 原文的地质活动和水是相对立的关系， 不是这里的 so that 引导的因果关系，错。 Question 10 of 13 正确答案：B 题目解析： B 以 2003 Global Surveyor data 做关键词定位至第四句，说没有 carbonate，而 carbonate 是大洋中经常有的，也就是说火星上没有 ocean，而且下一句说 cold dry 火星， 所以 B 正确。 Question 11 of 13 正确
41、答案：A 题目解析： hint: 暗示，示意。A 是线索;B 是特征;C 是论证;D 是效果。所以 A 的 clue 正确。对应 原文：Yet even setting aside the unproven hints of ancient oceans, the extent of the outflow channels suggests that a huge total volume of water existed on Mars in the past.原句说把未经证实的什么搁置，之前说除了 2000 年发现的一些 gully 之外， astronomers 没有直接证据，紧接着说
42、把未经证实的什么搁置，肯定是证据之类的意思，B 特 点 C 争论 D 影响都不对。 Question 12 of 13 正确答案：A 题目解析： A，两个过渡点，these landscape features 和 a number of ways，特别注意 a number of ways 应该是个提纲性的句子，所以应该尽量往前插，后面的若干句话都在叙述 outflow 与 runoff channel 的不同，所以 A 正确。these landscape features 指代前面的 relics of catastrophic flooding。 Question 13 of 13 正
43、确答案：ABE 题目解析： ABE Mars 选项对应原文第一段第三四句和第二段第一句， 正确。 Although 选项对应原文 第三段和第四段的第一句，正确。Various 选项 MS 对应第一段第一句，但原文没说相片有 various type，不选。The runoff 选项 MS 对应第一段倒数第二句，但原文没有将火星和地球 进行比较，不选。There is 选项对应第五段第一句和最后一句，正确。While 选项 MS 对应第 五段第一句，但原文说没有证据，答案说 dismiss 证据，说反，错。 以上是给大家整理的托福 TPO8 阅读 Passage3 原文文本+题目+答案解析，希望对你有所 帮助!