请教各位一些OG上的问题...有几题弄不明白...题目已补上

waigedet

OG12版的45.51.57.59的题目搞不太明白~可以帮我解释一下吗?谢谢

waigedet

感谢lz的解释~~可以再请教一题prep的题目吗?
为什么第三个选项不行呢?
谢谢

kenhu

45.人类学家想通过学习现代forager社会来获得古代祖先（也是forager社会）的信息，批评这种方式的
人说这是有缺点的，因为forager社会不断变化这，人类学家熟悉的forager社会与现代non forager社会
有很多contacts，换句话说就是从现代forager社会很难获得古代forager社会的信息。
弱化这个观点只要说明所有forager社会都有很多相同点，所以A就很明显了。
51.partially biodegradable只能降解agent，而不能降解塑料，所以每个partially biodegradable罐子产生的塑料垃圾并不比nonbiodegradable罐子少。
强化这个观点只要说明每个partially biodegradable罐子用的塑料多不就完了。
57.生活在雨林的人吃盐少所以血压不会随着年龄增加而增加，但是这些人在工业城市吃的盐多容易的高血压，题目要切断他们之间的联系那只要说明还有其他因素就行。
59.jhc不打洞的时候会吸引很多barnacles附在壳上，但是在一些地方jhc不打洞但是也不吸引barnacles，为啥呢，当然是他们经常脱壳-长壳-脱壳-长壳所以barnacles没法吸附。

waigedet

啊~真是不好意思~我以为大家都已经下了OG12....这几题弄不太明白~题目看的有点绕~请大家指点一下~

45. Some anthropologists study modern-day societies of foragers in an effort to learn about our ancient ancestors who were also foragers. A flaw in this strategy is that forager societies are extremely varied.  Indeed, any forager society with which anthropologists are familiar has had considerable contact with modern, non-forager societies.

Which of the following, if true, would most weaken the criticism made above of the anthropologists’ strategy?   A

(A) All forager societies throughout history have had a number of important features in common that are absent from other types of societies.
(B) Most ancient forager societies either dissolved or made a transition to another way of life.
(C) All anthropologists study one kind or another of modern-day society.
(D) Many anthropologists who study modern-day forager societies do not draw inferences about ancient societies on the basis of their studies.
(E) Even those modern-day forager societies that have not had significant contact with modern societies are importantly different from ancient forager societies.


51. One variety of partially biodegradable plastic beverage container is manufactured from small bits of plastic bound together by a degradable bonding agent such as cornstarch. Since only the bonding agent degrades, leaving the small bits of plastic, no less plastic refuse per container is produced when such containers are discarded than when comparable nonbiodegradable containers are discarded.

Which of the following, if true, most strengthens the argument above?   B

(A) Both partially biodegradable and nonbiodegradable plastic beverage containers can be crushed completely flat by refuse compactors.
(B) The partially biodegradable plastic beverage containers are made with more plastic than comparable nonbiodegradable ones in order to compensate for the weakening effect of the bonding agents.
(C) Many consumers are ecology-minded and prefer to buy a product sold in the partially biodegradable plastic beverage containers rather than in nonbiodegradable containers, even if the price is higher.
(D) The manufacturing process for the partially biodegradable plastic beverage containers results in less plastic waste than the manufacturing process for nonbiodegradable plastic beverage containers.
(E) Technological problems with recycling currently prevent the reuse as food or beverage containers of the plastic from either type of plastic beverage container.

57. Which of the following most logically completes the argument given below?    D

People in isolated rain-forest communities tend to live on a largely vegetarian diet, and they eat little salt. Few of them suffer from high blood pressure, and their blood pressure does not tend to increase with age, as is common in industrialized countries. Such people often do develop high blood pressure when they move to cities and adopt high-salt diets. Though suggestive, these facts do not establish salt as the culprit in high blood pressure, however, because _________.

(A) genetic factors could account for the lack of increase of blood pressure with age among such people
(B) people eating high-salt diets and living from birth in cities in industrialized societies generally have a tendency to have high blood pressure
(C) it is possible to have a low-salt diet while living in a city in an industrialized country
(D) there are changes in other aspects of diet when such people move to the city
(E) salt is a necessity for human life, and death can occur when the body loses too much salt


59. In order to withstand tidal currents, juvenile horseshoe crabs frequently burrow in the sand. Such burrowing discourages barnacles from clinging to their shells. When fully grown, however, the crabs can readily withstand tidal currents without burrowing, and thus they acquire substantial populations of barnacles. Surprisingly, in areas where tidal currents are very weak, juvenile horseshoe crabs are found not to have signifi cant barnacle populations, even though they seldom burrow.

Which of the following, if true, most helps to explain the surprising fi nding?   E

(A) Tidal currents do not themselves dislodge barnacles from the shells of horseshoe crabs.
(B) Barnacles most readily attach themselves to horseshoe crabs in areas where tidal currents are weakest.
(C) The strength of the tidal currents in a given location varies widely over the course of a day.
(D) A very large barnacle population can signifi cantly decrease the ability of a horseshoe crab to fi nd food.
(E) Until they are fully grown, horseshoe crabs shed their shells and grow new ones several times a year.

yizhutou1

最好把题目貼出来 不是每个人都有OG12的

waigedet

可以请大牛指点一下吗><...拜托了...