5月31日GMAT考试-逻辑新题（12-21）

赢智

12、又见sea otter..............................................................................................................................8
13、船速与鱼gwd变体....................................................................................................................9
14、监狱program............................................................................................................................10
15、怀孕实验...................................................................................................................................10
16、药物作用....................................................................................................................................11
17、养牛...........................................................................................................................................11
18、健身卡与设备............................................................................................................................12
19、维他命与骨头...........................................................................................................................12
20、ceo被fire..................................................................................................................................12
21、盖房子补赤字...........................................................................................................................12

赢智

12、又见sea otter
V1 from ffffighting
变体1. sea otter数量下降，判定原因为killer whales。killer whales捕食seals and sea lions（数量貌似也减少），但很少很少捕食sea otter。问解释

PS:大家考场上一定要小心此题。据考古此题众多变体版本
主人原话：跟qq309790244说得大概一致，但是一下子想不起是问解释还是支持了...

考古  from nowwsy
V1 from qq309790244
kill whale：seaotter数量减少。report说sealion 和seal也下降，killwhale吃sealion和seal，但是报告说killwhale吃seaotter   is rare，但在1980前根本没有报告。所以seaotter下降是由于killwhale。问支持

Babee2queen: Sea otter在六月机经里出现过加强的版本：
C）seals and sea lions的食物大量减少，但是sea otters的prey没有减少（正确答案）
e) 在kill whale到不了的bay的sea otters数量和kill whale到的了的数量都减少了。

GWD原题：
In the late 1980’s, the population of sea otters in the North Pacific Ocean began to decline. Of the two plausible explanations for the decline—increased predation by killer whales or disease—disease is the more likely. After all, a concurrent sharp decline in the populations of seals and sea lions was almost certainly caused by a pollution-related disease, which could have spread to sea otters, whereas the population of killer whales did not change noticeably.
Which of the following, if true, most seriously weakens the reasoning?
A.Killer whales in the North Pacific usually prey on seals and sea lions but will, when this food source is scarce, seek out other prey.
B.There is no indication that substantial numbers of sea otters migrated to other locations from the North Pacific in the 1980’s.  
C.Along the Pacific coast of North America in the 1980’s, sea otters were absent from many locations where they had been relatively common in former times.
D.Following the decline in the population of the sea otters, there was an increase in the population of sea urchins, which are sea otters’ main food source.
E.The North Pacific populations of seals and sea lions cover a wider geographic area than does the population of sea otters.

赢智

13、船速与鱼 GWD变体
V1 from ffffighting
变体2. 某种鱼类数量decline，是因为船速太快，容易与相撞。当地已有相关规定船只应减速，措施有效，因为鱼数量increase。问evaluation
只记得一个选项：Whether那些被撞的鱼正在mature的年龄。完全忘了选什么了。

主人原话：对就是这个的题干，细节有变动，选项基本改掉了
GWd：
Manatees, aquatic mammals inhabiting Florida’s rivers and coastal waters, swim close to the surface and are frequently killed in collisions with boats.  To address the problem, boat traffic in manatee-populated waters is being required to maintain very low speeds.  Unfortunately, manatees are unable to hear low-pitched sounds and a boat’s sound lowers in pitch as the boat slows.  Therefore, this approach may in fact make things worse rather than better.
Which of the following, if true, casts most doubt on the conclusion?
A.The areas where boats would have to maintain low speeds were decided partly on the basis of manatee-population estimates and partly from numbers of reported collisions between manatees and boats.
B.Because the water hyacinth that manatees feed on grows best in water that is nearly still, water hyacinth beds can be disturbed or damaged by fast-moving boat traffic.
C.Over the last several decades, boat traffic in Florida’s coastal waters has been increasing almost continuously and now represents the greatest threat to the endangered manatee population.
D.The sound of a boat engine generally travels much further under water than it does through the air.
E.When experimenters exposed manatees to the recorded sounds of boats moving at various speeds, the creatures were unable to discern the sounds over normal background noise.

赢智

14、监狱program
V1 from ffffighting
某监狱里有个program，貌似包括一些娱乐等措施（？不确定）。说这个program不好，因为入狱的人变多了。问解释或加强（真的记不请了）
我选的是最有喜感的选项：入狱waiting list的人争着要加这个program。

赢智

15、孕妇实验
V1 from damei12
一实验分两组，一组孕妇怀孕的时候吃维他命，生出来的BB更健康，另外一组， 没发现这个规律，解释paradox的原因

赢智

16、药物作用
V1 from damei12
P导致了O的disorder, 有人鄙视这个说法，说哦O 在P发生前就abnorm了，O disorder的真正原因是由于某drug导致的，说某drug如何如何 问评价

赢智

17、养牛
V1 from ephemeral00
关于奶牛的。说牛奶为了健康需要吃grass，为了多产奶需要吃clove。然后科学家做了实验，把奶牛放到草场上，草场上grass和clove都有， 让牛儿们随便吃。结果发现，这样喂出来的牛儿比吃人工混合的grass和clove饲料的牛儿产奶量大，虽然他们一样健康。问：由上推出哪个一定对。
我选的是放在草场上随便吃的牛儿们不会只吃clove（因为他们还很健康）。


考古  from nowwsy
V1
养奶牛的：农场有两种东西喂奶牛，一种是grass让奶牛更健康，一种是V可以提高产奶量。做了个实验：区域1、自由放养奶牛，V和g随便吃。区域2、控制奶牛每天吃V和g的比例，数月后，区域1的奶牛产奶量比后者多11%，问以下哪个可以帮助解释？我选：如果牧场地上种的V比g的数量的比例提高，产奶量会提高。        （因为从题中，我得出，奶牛更喜欢吃V。而吃V越多，产奶量越高。）
V2
问从上面的叙述可以得出什么结论。我选了‘牛一定吃了草’。（好像是D选项，因为牛健康，而吃草是牛健康的必要条件）
V3
问可以推出什么。选项有c在食料中的比例对奶牛产奶量不重要；实验组的奶牛吃东西消耗的energy比control组的少；如果给奶牛多吃点c，那么产奶量会增多。

赢智

18、健身卡与设备
V1 from ephemeral00
关于健身的。说调查发现，有xx%的人买了健身设备也不用，xx%的人买了gym的卡不去。然后作者就做结论：如果这些人不买健身设备，不买gym的卡，就能save money。
问assumption。我选的是有些不买也不去的人会把钱save下来。很可能不对。。。

赢智

19、维他命D与骨头
V1 from ephemeral00
关于vitman D的。说研究者做了两组对比实验，一组人吃一个小剂量的vitman D，另一组人吃大剂量的。结果发现吃大剂量的人的骨头结实什么的。于是做出结论：老年人们为了骨头健康，就要吃vitman D supplement。问assumption.
我选的是老年人自身不能合成vitman D什么的。。。
主人原话：题干是一样的，但是问题好像不一样

考古 from nowwsy
某试验，2组人，第一组服用10单位VC，第二组8VC，最后前一组的骨头比较健康。所以说VC有助于老年人骨骼健康。问加强
我选了答案 VC不会对阻碍老年人摔倒的各种因素其阻碍作用

赢智

20、CEo被fire
V1 from ephemeral00
关于CEO的。说有的公司经营不善，连连亏损，但还是花大价钱把CEO留下来，因为相信他们有expertise能让公司起死回生。然后作者就说了，这是不对的，应该把他们fire了，因为他们在位时就没把公司弄好。问assumption。
我选的是：这些CEO在位的时候条件允许他们把公司管理好还是怎么的了。。。（没看太仔细就选了。。。）