27/4,新老观点对比型
第一段:主题段:星星年龄的重新判断影响了星座形成理论。原因
第二段:老观点:星座形成时间短,所以星星年龄相似
第三段:B的观察否定了老观点
第四段:提出新观点:星座形成的时间长,被计算机模型所证实。
主题句:New observations about the age of some globular clusters in our Milky Way galaxy (Milky Way galaxy: n.[天]银河系) have cast doubt on a long-held theory about how the galaxy was formed. The Milky Way contains about 125 globular clusters (compact groups of anywhere from several tens of thousands (tens of thousands: 好几万) to perhaps a million stars) distributed in a roughly spherical halo around the galactic nucleus (galactic nucleus: [天]星系核). The stars in these clusters are believed to have been born during the formation of the galaxy, and so may be considered relics of the original galactic nebula (galactic nebula: n.[天]银河星云), holding vital clues to the way the formation took place.原因:星星产生于星座形成时。 第一段:对星星年龄的观察否定了旧的星座形成理论。原因。
The conventional theory of the formation of the galaxy contends that roughly 12 to 13 billion years ago the Milky Way formed over a relatively short time (about 200 million years) when a spherical cloud of gas collapsed under the pressure of its own gravity into a disc surrounded by a halo. Such a rapid formation of the galaxy would mean that all stars in the halo should be very nearly the same age.老观点:星座形成的时间短,说明星星年龄相似
However, the astronomer Michael Bolte has found considerable variation in the ages of globular clusters. One of the clusters studied by Bolte is 2 billions years older than most other clusters in the galaxy, while another is 2 billion years younger. A colleague of Bolte contends that the cluster called Palomar 12 is 5 billion years younger than most other globular clusters.
第三段:B的观察:星星年龄差据大,否定了老观点。
To explain the age differences among the globular clusters, astronomers are taking a second look at “renegade” theories. One such newly fashionable theory, first put forward by Richard Larson in the early 1970’s, argues that the halo of the Milky Way formed over a period of a billion or more years as hundreds of small gas clouds drifted about, collided, lost orbital energy, and finally collapsed into a centrally condensed elliptical system. Larson’s conception of a “lumpy and turbulent” protogalaxy is complemented by computer modeling done in the 1970’s by mathematician Alan Toomre, which suggests that closely interacting spiral galaxies could lose enough orbital energy to merge into a single galaxy.RL提出新观点:星座形成的时间长。被子AT的计算机模型所证实。
140. If Bolte and his colleague are both correct, it can be inferred that the globular cluster Palomar 12 is approximately
(A) 5 billion years younger than any other cluster in the galaxy
(B) the same age as most other clusters in the galaxy
(C) 7 billion years younger than another cluster in the galaxy
(D) 12 billion years younger than most other clusters in the galaxy(C)
(E) 2 billion years younger than most other clusters in the galaxy
这题我一直没有明白 读了OG的解释也不理解 能帮助讲讲吗 谢谢
数学题, 5+2
班机里面,一个同学比大多数同学大2岁,但是有个同学比大多数同学小了5岁。问:这个班级可能的年龄差是多少? 明白了吧。
谢谢班主 这题有生以来第一次明白了
再次感谢 祝一切顺利
想问问答案E为什么不对?文中Palomar 12 is 5 billion years younger than most other globular clusters 那么肯定是2 billion years更多的clusters了,E应该是对的啊?难道是most other globular clusters 和 other clusters in the galaxy含义不一样吗?希望得到答复。
上面的问题顶一下。我也想知道。
想问问答案E为什么不对?文中Palomar 12 is 5 billion years younger than most other globular clusters 那么肯定是2 billion years更多的clusters了,E应该是对的啊?难道是most other globular clusters 和 other clusters in the galaxy含义不一样吗?希望得到答复。
这题我开始也错了,想了半天半天半天,觉得这么解释比较好:
这段在做时间上的比较。有比较,必然有比较的基点!这里的时间基点是most other clusters的age!
2b younger,2b older&5b younger全都是以most来算的。所以选项里也应该以most为基点来判断。你说5〉2,就是以P 12为基点,所以不对。
拍砖拍砖!大家讨论啊
呵呵,终于看到答复了。
但我还是不太理解,希望我不要钻到牛角尖了
1 Palomar 12 is 5 billion years younger than most other globular clusters 摘自原文
2 Palomar 12 is approximately 2 billion years younger than most other clusters in the galaxy E答案
我觉得从 1=〉2 因为1中符合条件的cluster个数一定小于2中符合条件的cluster个数。换句话说符合1条件的cluster一定在符合句2条件的cluster中。不知道我说没有说清楚。
呵呵,终于看到答复了。
但我还是不太理解,希望我不要钻到牛角尖了
1 Palomar 12 is 5 billion years younger than most other globular clusters 摘自原文
2 Palomar 12 is approximately 2 billion years younger than most other clusters in the galaxy E答案
我觉得从 1=〉2 因为1中符合条件的cluster个数一定小于2中符合条件的cluster个数。换句话说符合1条件的cluster一定在符合句2条件的cluster中。不知道我说没有说清楚。
你说清楚了,可是没看清楚我的意思。我就猜你是这么想的,所以说比较有个基点问题:
比如说,大多数都是10billion years(注意:这里的10是指从我们现在的时间倒退10,像公元前……),那么P12大约5billion years(我们就说是公元前5billion吧)E里面P12是公元前8billion years,显然不对啊,如果算出来大概是公元前4,3,2,1就可以,往前算就不行,也就是说你算出来的那个时间P12必须存在。那么往后算它肯定在,往前就不一定了。
不知道我说清楚没有。反正我是这么想的。
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