【更新完毕，附个人整理狗】芭妖妖，北京一战720，放狗（回报CD，特别给不自信的筒子）

vitalia

祝福楼主雅思继续爆发小宇宙~~~


问下楼主，阅读的background那些资料用处大不？应该怎么用啊？

-- by 会员 IvyDC (2010/8/13 6:29:09)

谢谢~~

in fact, background那些远远不够。。。呵呵 我在一楼已经说了，一定要勤找资料进行补充，在google上搜就行了， 看一遍知道相关词和主要意思就行

oranrona

想问问MM~
10，46 √说一个机器一开始输入的是ABCDEFG，输出一次后变成DABCGEF,其改变的方式不变，问经过至少几次又得到的输出结果又变成ABCDEFG
我选12 前面四次一循环，后面三次一循环
同意!

这道题讨论稿不是说要剪掉第一次，所以是11嘛？谢谢！

vitalia

只是举例告诉怎么循环的 没说那个算一次 我数学93% 有错题 你再讨论下吧

gitarrelieber

麻烦楼主帮我看气候变冷是不是下面这篇，如果是具体是那些段？http://funnel.sfsu.edu/courses/gmo405/articles/SciAm1991.PlateauUpliftClimChng.pdf

During the past 40 million years, andparticularly during the past 15 million years, this warm, wet climate largelydisappeared. Colder climates and much greater regional extremes ofprecipitation have developed. What caused this cooling and diversification ofclimate and vegetation into a complex mosaic of many regionally distinctivetypes?

One school of though focuses onthe changing positions of the earth’s continents and oceans. The Atlantic Oceanhas expanded at the expense of the Pacific Ocean, whereas an ancient equatorialsea that extended across much of Eurasia (called the Tethys Sea) has shrunk tobecome the modern, much smaller Mediterranean Sea. In addition, the fraction ofcontinents flooded by shallow inland seas has slowly decreased, exposing largeamounts of land and creating climates less moderated by thetemperature-stabilizing effects of oceans. Computer model simulations show thatchanges in the arrangement of the continents and the size of inland seas canhave important effects on global climate over very long internvals of geologictime. But they are significantly less convincing as sole explanations for thedramatic changes of the past 40 million years.
Another possiblity is a long-term decline inthe concentration of carbon dioxide in the atmosphere, which would lessen theamount of heat trapped by the atmosphere and lead to “greenhouse cooling.” Theamount of carbon dioxide in the earth’s atmosphere over million-year timescales is controlled by two major processes. Chemical weathering of continentalrocks removes carbon dioxide from the atmosphere and carries it in dissovledchemical from to the ocean, where it is taken in by marine biota and depositedin sediments on the seafloor. Tectonic activity eventually frees this trappedcarbon dioxide, in the earth’s lithospheric plates transports the seafloor toocean trenches, where subduction carries old crust and sediments down towardthe earth’s hot interior. At great depths, the sediments melt, releasing carbondioxide, which emerges from the volcanic islands that overlie the buried curstand rejoins the atmosphere, completing the cycle.
If the pace of seafloor speading (and hence ofsubduction) slowed significantly, less carbon dioxide would be vented to theatmosphere, the atmosphere would become relatively depleted of carbon dioxideand temperatures would fall. In fact, globally averaged seafloor spreadingrates slow little or no net change in the past 40 million years. Subduction and volcanism eventually return the carbondioxide to the atmosphere, but this process requires a long time (tens tohundreds of millions of years) to complete.
Plateau uplift may alter climateby increasing chemical weathering of rocks, thereby recuding atmospheric carbondioxide concentrations. Carbon dioxide combines with rainwater and ground waterto form carbonic acid, which reacts with silicate minerals in rocks duringweathering. The resulting bicarbonate ions drain into the oceans, where theyare taken up by marine animals such as plankton and corals and eventuallydeposited on the seafloor. The net effect is that chemical weathering removescarbon dioxide from the atmosphere and locks it away at the bottom of theoceans.
Maureen Raymo proposed thatuplift of plateaus and mountain ranges has increased the rate of chemicalerosion of continental rock on the globally averaged basis. Uplift couldenhance chemical weathering in several ways. Heavy monsoons, which develop atthe margins of platueaus, unleash particularly intense rainfall. In theseregions, uplift-related faulting and folding also expose fresh rock to theweathering process. Moreover, the steeper slopes created by plateau uplift causefaster runoff, which removes erosion products and intensifies the chemicalattack on the rock. Raymo suggests that long-term uplift in Tibet and otherregions may have increased the rate at which carbon dioxide is removed from theatmosphere. In this way, concentrations would have fallen even though theamount of carbon dioxide exhaled by volcanoes (as inferred from seafloorspeading rates) remained nearly constant. Falling carbon dioxide levels wouldreduce the ability of the atmosphere to retain heat, thereby amplifying theglobal cooling.

Inflation

恭喜lz啊 gmac不给我们真题 狗狗就是俺们的真题 哈哈 一定得好好研究 lz的AA证明了我没有偏题 谢谢啦

vitalia

麻烦楼主帮我看气候变冷是不是下面这篇，如果是具体是那些段？http://funnel.sfsu.edu/courses/gmo405/articles/SciAm1991.PlateauUpliftClimChng.pdf

During the past 40 million years, andparticularly during the past 15 million years, this warm, wet climate largelydisappeared. Colder climates and much greater regional extremes ofprecipitation have developed. What caused this cooling and diversification ofclimate and vegetation into a complex mosaic of many regionally distinctivetypes?

One school of though focuses onthe changing positions of the earth’s continents and oceans. The Atlantic Oceanhas expanded at the expense of the Pacific Ocean, whereas an ancient equatorialsea that extended across much of Eurasia (called the Tethys Sea) has shrunk tobecome the modern, much smaller Mediterranean Sea. In addition, the fraction ofcontinents flooded by shallow inland seas has slowly decreased, exposing largeamounts of land and creating climates less moderated by thetemperature-stabilizing effects of oceans. Computer model simulations show thatchanges in the arrangement of the continents and the size of inland seas canhave important effects on global climate over very long internvals of geologictime. But they are significantly less convincing as sole explanations for thedramatic changes of the past 40 million years.
Another possiblity is a long-term decline inthe concentration of carbon dioxide in the atmosphere, which would lessen theamount of heat trapped by the atmosphere and lead to “greenhouse cooling.” Theamount of carbon dioxide in the earth’s atmosphere over million-year timescales is controlled by two major processes. Chemical weathering of continentalrocks removes carbon dioxide from the atmosphere and carries it in dissovledchemical from to the ocean, where it is taken in by marine biota and depositedin sediments on the seafloor. Tectonic activity eventually frees this trappedcarbon dioxide, in the earth’s lithospheric plates transports the seafloor toocean trenches, where subduction carries old crust and sediments down towardthe earth’s hot interior. At great depths, the sediments melt, releasing carbondioxide, which emerges from the volcanic islands that overlie the buried curstand rejoins the atmosphere, completing the cycle.
If the pace of seafloor speading (and hence ofsubduction) slowed significantly, less carbon dioxide would be vented to theatmosphere, the atmosphere would become relatively depleted of carbon dioxideand temperatures would fall. In fact, globally averaged seafloor spreadingrates slow little or no net change in the past 40 million years. Subduction and volcanism eventually return the carbondioxide to the atmosphere, but this process requires a long time (tens tohundreds of millions of years) to complete.
Plateau uplift may alter climateby increasing chemical weathering of rocks, thereby recuding atmospheric carbondioxide concentrations. Carbon dioxide combines with rainwater and ground waterto form carbonic acid, which reacts with silicate minerals in rocks duringweathering. The resulting bicarbonate ions drain into the oceans, where theyare taken up by marine animals such as plankton and corals and eventuallydeposited on the seafloor. The net effect is that chemical weathering removescarbon dioxide from the atmosphere and locks it away at the bottom of theoceans.
Maureen Raymo proposed thatuplift of plateaus and mountain ranges has increased the rate of chemicalerosion of continental rock on the globally averaged basis. Uplift couldenhance chemical weathering in several ways. Heavy monsoons, which develop atthe margins of platueaus, unleash particularly intense rainfall. In theseregions, uplift-related faulting and folding also expose fresh rock to theweathering process. Moreover, the steeper slopes created by plateau uplift causefaster runoff, which removes erosion products and intensifies the chemicalattack on the rock. Raymo suggests that long-term uplift in Tibet and otherregions may have increased the rate at which carbon dioxide is removed from theatmosphere. In this way, concentrations would have fallen even though theamount of carbon dioxide exhaled by volcanoes (as inferred from seafloorspeading rates) remained nearly constant. Falling carbon dioxide levels wouldreduce the ability of the atmosphere to retain heat, thereby amplifying theglobal cooling.

-- by 会员 gitarrelieber (2010/8/13 19:34:10)

差不多就是它！！

oranrona

谢mm!周一就要考了，好忐忑，看见好多人平时正确率很好的，考完也才600+，不知道为什么啊~希望像楼主这么好运啊！沾点喜气！

seventrees

快考试了，沾点喜气。

另外跟lz求证：
密码那道题，是从0-9里选3个，从25个字母（不包括O）里选3个，不计顺序，问能组成多少个密码？
这个选择可以重复吗？比如说999aaa？
可以重复的话是10*10*10*25*25*25
不能重复的话是10*9*8*25*24*23

vitalia

快考试了，沾点喜气。

另外跟lz求证：
密码那道题，是从0-9里选3个，从25个字母（不包括O）里选3个，不计顺序，问能组成多少个密码？
这个选择可以重复吗？比如说999aaa？
可以重复的话是10*10*10*25*25*25
不能重复的话是10*9*8*25*24*23

-- by 会员 seventrees (2010/8/14 9:21:17)

我那句是对机经里的补充 可以重复

vivianzhili

厉害