本帖最后由 kila1002 于 2010-8-1 21:22 编辑
题目有点多，一道道来，辛苦了。。。。。
Variations in the Climate (TPO10)
One of the most difficult aspects of deciding whether current climatic events reveal evidence of the impact of human activities is that it is hard to get a measure of what constitutes the natural variability of the
climate. We know that over the past millennia the climate has undergone major changes without any significant human intervention. We also know that the global climate system is immensely complicated and that everything is in some way connected, and so the system is capable of fluctuating in unexpected ways. We need therefore to know how much the climate can vary of its own accord in order to interpret with confidence the extent to which recent changes are natural as opposed to being the result of human activities.
1. According to paragraph 1, which of the following must we find out in order to determine the impact of
human activities upon climate?
A The major changes in climate over the past millennia
B The degree to which the climate varies naturally
C The best method for measuring climatic change
D The millennium when humans began to interfere with the climate
答案是B，我选的是C。文章中有提到是很难找到一个方法来检测啊，为什么C不行，这个应该和C选项的绝对此没关系吧
The Rise of Teotihuacan (TPO8)
Paragraph 3 This last factor is at least circumstantially implicated in Teotihuacán’s rise. Prior to 200 B.C., a number of relatively small centers coexisted in and near the Valley of Mexico. Around this time, the largest of these centers, Cuicuilco, was seriously affected by a volcanic eruption, with much of its agricultural land covered by lava. With Cuicuilco eliminated as a potential rival, any one of a number of
relatively modest towns might have emerged as a leading economic and political power in Central Mexico. The archaeological evidence clearly indicates, though, that Teotiluacan was the center that did arise as the predominant force in the area by the first century A.D.
7. What can be inferred from paragraph 3 about Cuicuilco prior to 200 B.C.?
A It was a fairly small city until that date.
B It was located outside the Valley of Mexico.
C It emerged rapidly as an economical and political center.
D Its economy relied heavily on agriculture.
答案是D，我选的是C。
Extinction of the Dinosaurs (TPO8)
Paragraph 5 lr has not been common at Earth’s since the very beginning of the planet’s history. Because it usually exists in a metallic state, it was preferentially incorporated in Earth’s core as the planet cooled and consolidated. lr is found in high concentrations in some meteorites, in which the solar system’s original chemical composition is preserved. Even today, microscopic meteorites continually bombard Earth, falling on both land and sea. By measuring how many of these meteorites fall to Earth over a given period of time, scientists can estimate how long it might have taken to deposit the observed amount of lr in the boundary clay. These calculations suggest that a period of about one million years would have been required. However, other reliable evidence suggests that the deposition of the boundary clay could not have taken one million years. So the unusually high concentration of lr seems to require a special explanation.
10. Paragraph 5 implies that a special explanation of lr in the boundary clay is needed because
A the lr in microscopic meteorites reaching Earth during the Cretaceous period would have been incorporated into Earth’s core
B the lr in the boundary clay was deposited much more than a million years ago
C the concentration of lr in the boundary clay is higher than in microscopic meteorites
D the amount of lr in the boundary clay is too great to have come from microscopic meteorites during the time the boundary clay was deposited
这道题目答案是D，我选的是B。这道题目我看都看不大懂。。。。
Running Water Mars (TPO8)
Paragraph 1 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
channels are found in the southern highlands. These flow features are extensive systems―sometimes hundreds of kilometers in total length―of interconnecting, twisting channels that seem to merge into
larger, wider channels. They bear a strong resemblance to river systems on Earth, and geologists think that 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.
2. 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 Earth’s.
D The rivers of Mars began to dry up about 4 billion years ago.
答案是B，我选的是D。
还有20天就考了。。。。我感觉我阅读总上不去啊。。。。。每次有点信心了，做套TPO信心又被打压下去了。。。。我想死的心都有了。。。。。救命啊。。。。 | 
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楼主: caoxuemei
发表于 2010-8-1 15:14:59
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