11.4 早场放狗

飞樱飘雪

感谢CD总结，虽然最后只有670，但是阅读碰上很多，数学见到大量重题，感恩回馈献上”第一次“，有再回忆起来的再补：
quant
确认2，题还挺复杂，什么以c1-r2矩阵排列1234，再从c3-r3排列56789以此规律平铺，当时看jj就一脸懵逼，答案跟jj一致
考了一个什么median的数，好像有12个数从小到大排列 (I)前6个数<=20 (II)后六个数>=20，选了c
确认6，10，41，48，50
有个速度题，具体记不清了，大概就是a, b, c一起做一个项目要xmin，a要amin，b要bmin，问c自己要做多久
有个维恩图题，买shares，bonds还有certificates各有多少人，总共有x人，三种都买的有y人，然后买certificate的势必会买shares（记不清具体哪两种）, 然后好像问买bonds或者shares的人数？（画了好几遍图，还差点算错了）
给出xa^ 4+yb^3=5，然后问如何求出x+y（差不多这个意思）(I)xa^ 4=x (II)yb^3=y，我选了b
有个关于一元二次方程组／两条线相交的，问怎样有至少一个解，(I) 好像是b^2-4ac>=0 (II)等同于讲4ac<0，我选了d
70 汇率那道也碰到了，但是题目给了两个1eu=1.xxx us，然后问以美元为标准的欧元变化，有点蒙，不知道算的对不对
有三位数分别是abc，bca，cab什么的，问三个的和能不能被整除还是问余数之类的
有个长方体灌满水，水再倒进圆柱体里，求高，题里有一个以horizontal摆，没搞懂纠结了很久，我当成圆做底面求的
有一个题，5^a，11^b，然后r(I)代表5^a百位，(II) 11^b的十位，好像还有别的条件，是我不擅长的领域，一下子就懵了，个人选了c

verb
二战sc明显顺手很多。cr还是选完了也不知道对不对，cr倒是碰到一个讲Vit D的。阅读碰到好几篇jj，但是一看题又选不出来，考友们有没有人能指点一下cr和rc orz
jj3 确认empathy那道题，其他4个选项明显不对。其他主旨题和第二段作用题的选项让我纠结了一下。jj nowwsy那部分基本上都提到了
jj18 有一道题问这个实验说明哪种可以增加年度平均销售，比如current client 收到普通打折的，perspective client收到打折更多的，我选了e所有人的那个。（没仔细读又怕做不完，妥妥跪了）
jj22 主旨题，jj说不难但是我又纠结了，跟jj的选了。食物链题问以前的模型为什么预测不准确，我选了有zooplankton那个词的
好像还有一篇但是记不清了
时间安排的不太好，基本没怎么读原文，全靠jj理解，然后先看题再读文章，选项基本上能排除3个，剩下2-3个根本不会选，应该是我太菜了=。=4篇其实都不难，能读懂，明显没进高分库……

趁着还记得，IR一起写了，8分。有个同心圆图表示2012-2013年每个月的气温，问不同年哪个月的气温高低方向不同，只有一个月是2013年温度高过2012年的，不难实验，4组病人先告诉医生猜测的病症是abcd，第5组不告诉，然后问了是不是告诉病症的最后确诊和推断一致的概率更高，然后问了一些某个病症中位数和其他病症的min／max的比较，不难
一个圆分了5部分abcde rating （1-2，3-4……9-10），c占45%左右，选项问ratings的median／mean／greates等于mode／minimum／xxx？我自己也看的一脸懵逼==
有道很像sc的题，大概就是a任命b，he任命c&d，问这句话哪里没有讲清楚，我选的任命cd的he指代的人称不明
某个产品cost x$，y 人买，每增加5$，人会遵从某个公式减少，问涨第一个5$和第二个5$之后的人数？
产品里有残次品概率2%，选的残次品并被查出的概率98%，选的好品被误诊为残次品概率2%，问the possiblity that a dificit product and dected; the possibility that a non-deficit product and wrongly detected as deficit.各选了2%*2%；98%*98%。（这题也让我纠结了一下，主要不知道dificit product是前提条件还是非前提）

作文考的cafe 的一段，好像CR见过，说咖啡店把投诉网址印在收据上方便投诉，投诉数量很少，所以cafe没有需要改进的地方。我写了receipt这个方式不好、然后数据不全没考虑实体店投诉、没考虑同行竞争。上次awa写的状态很不好，于是这次连模板都没背现场发挥了，坐等出成绩。

总之，这么多原题才只考了670实在愧对CD，也求路过大神指点迷津

billyisfragile!

JOURNAL ARTICLE
ECOSYSTEMS ON THE BRINK
Carl Zimmer
Scientific American
Vol. 307, No. 4 (OCTOBER 2012), pp. 60-65
Published by: Scientific American, a division of Nature America, Inc.
https://www.jstor.org/stable/26016128
Page Count: 6

In the Northwestern Atlantic, for example, cod fisheries collapsed in the early  1990s. Cod are voracious predators, and  with their disappearance came a boom in  their prey, including sprats, capelins, young  lobsters and snow crabs. To try to allow cod  to recover, managers put strict limits on cod  fishing or even banned it altogether. The  mathematical models they relied on indicated that if the fish were left unmolested, they  would be able to lay enough eggs and grow  fast enough to rebuild their population.

“The predictions for recovery were on  the order of five to six years,” says Kenneth Frank, a research scientist at Fisheries and  Oceans Canada at the Bedford Institute of Oceanography who studies cod fisheries off  the coast of Nova Scotia and Newfoundland. The predictions were wrong, however. Even after six years, the  cod showed no sign of recovery. Instead the species languished at a few percent of its pre-collapse population.

Frank and his colleagues have now figured out why: the initial estimates were based only on how fast cod can reproduce, not on how the whole food web is organized. Adult cod feed on sprats and capelins and other prey known collectively as forage  fish. The forage fish, in turn, eat tiny animals known as zooplanktons, including the eggs and larvae of cod themselves.

西北部太平洋里的COD是和另外一种叫forage fish的鱼的关系，基本上和JJ一样，COD减少之后，forage fish作为COD的prey，它的量就增加了，然后它又能吃COD的幼虫，所以COD量就更少了。知道forage fish的食物需求量达到环境上限，才能让它的数量下降

Before cod were overfished, they kept the forage fish in check, so that the small fish could not eat enough eggs and larvae to put a dent in the cod population. Once humans lowered the cod population, though, the tables were turned. The forage  fish boomed and could devour a substantial fraction of the young cod. Even without humans fishing them, the cod were unable to rebound.
第三段：后来就开始针对这个采取措施，又过了好多年在xx年数量才恢复到原来的30%

第三段：其他F减少的原因；好像是说由于F鱼数量变多，后来自己的food supply出现了问题（这里有题），最后截止至2002年（好像是这个时间），COD鱼的数量还是有所增加

Only now are Frank and his co-workers seeing signs of a delayed recovery. After falling to as low as 1 percent of their pre-crash levels, the cod have risen in recent years to 30 percent. The key,  Frank says, is that the forage fish have exploded to such high numbers that they are outstripping their own food supply and are starting to crash. Now that their population has dropped, cod eggs and larvae have a much better chance to reach adulthood. If cod can return to their former levels, they will be able  to keep the populations of forage fish down once more. “That’s the trajectory they’re on, but there are lots of surprises because these ecosystems are so complex,” Frank says.

billyisfragile!

http://discovermagazine.com/2008/jan/can-vitamin-d-save-your-life

Can Vitamin D Save Your Life?
New studies highlight the importance of the forgotten vitamin.
By Mariana Gosnell
Wednesday, December 12, 2007

P1 Viamin D 被称为”sunshine vitamin" 因为它在阳光的帮助下可以合成更多的维他命，有助于减缓骨质疏松

For years doctors believed that vitamin D, sometimes called the “sunshine vitamin” because sunlight triggers the body to produce it, was important primarily in preventing rickets (a softening of the bones) in children. Once milk became fortified with vitamin D, rickets pretty much disappeared, and the problem of vitamin D deficiency seemed to have been solved. But according to Michael F. Holick, director of the Vitamin D, Skin, and Bone Research Laboratory at Boston University Medical Center, who has spent 30 years studying the vitamin, “rickets can be considered the tip of the vitamin D–deficiency iceberg.”

rickets (noun) = a disease which children who do not have enough vitamin D can suffer from, in which the bones become soft and not shaped correctly
tip of the iceberg = a small, noticeable part of a problem, the total size of which is really much greater; only a small part of a much larger problem

第二段就讲了时至今日大家对维生素D的进一步认识，这一段讲的是研究发现维生素D可以有效预防癌症，给了一个实验的案例：有三组人作为样本，第一组只服用钙片，第二组是钙片+维生素D，第三组是钙片+安慰剂placebo，然后观察这群人cancer的发病率，发现
第二组有显著的较低的cancer率。

A recent laboratory experiment at Boston University revealed that by activating the circulating form of the vitamin, prostate cells could regulate their own growth and possibly prevent the rise of cancer. Directly or indirectly, Holick points out, “the active form of vitamin D controls up to 200 different genes,” including ones responsible for cell proliferation, differentiation, and death.

第二段做了个实验 比较女人只吃钙 钙里还有很多vitamin d和吃placebo的对比 吃钙的女cancer rate低比另一组低

Theories about vitamin D’s cancer-prevention qualities have begun to be validated. In June, Joan M. Lappe, professor of nursing and medicine at Creighton University School of Medicine in Omaha, and her colleagues published the results of a 4-year, double-blind, randomized trial in which nearly 1,200 healthy postmenopausal women took calcium alone, calcium with 1,100 international units (IU) of vitamin D a day, or a placebo. The women who took calcium with vitamin D had a 60 percent lower risk of developing cancers of any type than the placebo group; the calcium-only group’s risk didn’t significantly change.

除了cancer, vitamin D还可以使人们对感染没有那么vulnerable, 说了在非洲的人需要比白人接受更多的光照来保持一样的抵抗力，细胞里有一种B物质 Vitamin D可以stimulate这种物质的产生 然后增强抵抗力

第三段讲了一个病（叫turbu...什么），是African American比较容易患的病，因为他们相对于高加索人而言自身合成的维生素D更少，所以如果他们服用维生素D可以减少患病概率，然后再补充了下维生素D的作用什么的，就是强调维生素D确实有许多医疗用途。

Vitamin D status may also affect vulnerability to infections. For example, African Americans need more sun exposure than Caucasians to make sufficient vitamin D; they also suffer from increased risk of tuberculosis. In a breakthrough study published in March, scientists from several institutions, including UCLA, discovered a possible link. On encountering the TB bacillus, receptors on immune-system scavenger cells known as macrophages stimulate the conversion of circulating vitamin D to its active form, which produces a peptide that destroys the bacillus. If circulating levels of D are low, macrophages can’t activate the vitamin D to initiate this response. A similar scenario could be operating with other infectious agents, maybe even the influenza virus.

小猫Mandy

bzy! 发表于 2019-11-4 21:46
http://discovermagazine.com/2008/jan/can-vitamin-d-save-your-life

Can Vitamin D Save Your Life?

请问在哪找到的？

飞樱飘雪

bzy! 发表于 2019-11-4 21:45
JOURNAL ARTICLE
ECOSYSTEMS ON THE BRINK
Carl Zimmer

文章我都懂，题目就是选不出来

billyisfragile!

小猫Mandy 发表于 2019-11-4 22:16
请问在哪找到的？

http://discovermagazine.com/2008/jan/can-vitamin-d-save-your-life

fangchen616

bzy! 发表于 2019-11-4 21:46
http://discovermagazine.com/2008/jan/can-vitamin-d-save-your-life

Can Vitamin D Save Your Life?

你觉得文章结构能选机经里写的“第一段提出一个widely accepted观点，第二第二段提出less widely accepted的观点”吗，我感觉不太对。 因为第一段的观点就是“治软骨病只是冰山一角的作用“，而我觉得后面两段在支持这个观点。

慕亦哥

感谢分享！               

未解

感谢分享！               

taurus_gzy

给出xa^ 4+yb^3=5，然后问如何求出x+y（差不多这个意思）(I)xa^ 4=x (II)yb^3=y，我选了b

楼主这个为啥选b啊 不是c吗