[求助]求教几道GWD-TN的逻辑题，感觉难度很大

Political advocacy groups have begun to use information services to disseminate information that is then accessed by the public via personal computer.  Since many groups are thus able to bypass traditional news sources, whose reporting is selective, and to present their political views directly to the public, information services present a more balanced picture of the complexities of political issues than any traditional news source presents.

Which of the following is an assumption on which the argument above depends?

A.      Information services are accessible to enough people to ensure that political advocacy groups can use these services to reach as large a percentage of the public as they could through traditional news sources.

B.      People could get a thorough understanding of a particular political issue by sorting through information provided by several traditional news sources, each with differing editorial biases.

C.      Information on political issues disseminated through information services does not come almost entirely from advocacy groups that share a single bias.

D.      Traditional news sources seldom report the views of political advocacy groups accurately.

E.       Most people who get information on political issues from newspapers and other traditional news sources can readily identify the editorial biases of those sources.

答案是C，搞不懂为什么选这个。

Which of the following is most strongly supported by the information given?

A.      Fossils of whale species dating from between sixty million and fifty million years ago will not be found on continents that were at the time separated from ancient Asia by wide expanses of ocean.

B.      Among whale fossils that date from later than about fifty million years ago, none are fossils of whale species that drank only fresh water.

C.      Fossils of whale species that drank fresh water will not be found in close proximity to fossils of whale species that drank salt water.

D.      The earliest whales that drank salt water differed from fresh-water-drinking whales only in their possession of specialized kidneys.

E.       Between sixty million and fifty million years ago, the freshwater lakes and rivers in which whales originated were gradually invaded by salt water.

答案选A，A选项的意思没看懂啊。

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.

答案选E，我怎么觉得应该选D阿。

In polluted environments, dolphins gradually accumulated toxins in their body fat, and the larger the dolphin, the more accumulated toxin it can tolerate.  Nearly 80 percent of the toxins a female dolphin has accumulated pass into the fat-rich milk her nursing calf ingests.  Therefore, the unusually high mortality rate among dolphin calves in the industrially contaminated waters along Florida’s Gulf
                        Coast is probably the result of their being poisoned by their mother’s milk.

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

A.      The survival rate of firstborn dolphin calves in the area along Florida’s Gulf
                        Coast is highest for those whose mothers were killed before they were weaned.

B.      The rate at which adult dolphins living in the waters along Florida’s Gulf
                        Coast accumulate toxins is no higher than that of adult dolphins in comparably polluted waters elsewhere.

C.      Among dolphin calves born in the area along Florida’s Gulf
                        Coast, the mortality rate is highest among those with living siblings.

D.      As dolphins age, they accumulate toxins from the environment more slowly than when they were young.

E.       Dolphins, like other marine mammals, have a higher proportion of body fat than do most land mammals.

答案选A，但是我选了B。

感觉GWD-TN 15套以后的逻辑难度增加了好多，好多题的选项感觉看完一遍都不对，实战的题和这些题是一个路子么？

Political advocacy groups have begun to use information services to disseminate information that is then accessed by the public via personal computer.  Since many groups are thus able to bypass traditional news sources, whose reporting is selective, and to present their political views directly to the public, information services present a more balanced picture of the complexities of political issues than any traditional news source presents.
            

PA group 用info serv来散播public可以得到的信息。

许多groups都可以绕过Traditional source（selective，理解为会河蟹一些东西），直接向public（我的理解是通过info serv的途径）展示自己的政治立场，所以info serv 大于traditional source in presenting a more balanced picture of the complexities of political issues（结论）

问假设，就是先加强后取非削弱

C选项--Information on political issues disseminated through information services does not come almost entirely from advocacy groups that share a single bias

说通过info serv散播的政治info不是全部来自PA这个只share single bias的组织。加强了可以提供更加全面balanced和复杂的（不是single bias，有多家之言）。然后取非，如果全部来自PA group，那么即使bypass了traditional，offer给public的也不是全面的，而是PA的一家之言（我的理解是某党在某国的喉舌之类的意思），所以削弱了

不知道回答的好不好，请指教

Fossils of whale species dating from between sixty million and fifty million years ago will not be found on continents that were at the time separated from ancient Asia by wide expanses of ocean.

意思是在between sixty million and fifty million years ago （也就是还没有进化出可以喝海水的kindney的时候，因为60 ago产生鲸鱼，10 later，也就是50 ago的时候才有特殊的肾，中间这段时间没有进化出来这种kidney）鲸鱼的化石不能被发现在以前曾经离ancient asia很远的海洋里（现在变成了陆地，沧海桑田嘛）

归纳题，原文支持选项，所以对了，因为必须经常游回去喝水，所以不能离太远

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.
            

文章说M不能hear low-pitch sounds，结论是减速会使情况变得更糟。

D.      The sound of a boat engine generally travels much further under water than it does through the air.
                    

声音在water和air中的传播速度没关系，M又不会在air里面听见，irrelevant

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.
                    

如果M不能从背景声音中区分出boat在不同速度下的声音，也就是说速度快慢产生的sounds对于M来说没有意义，反正不管什么速度他都听不见，那么减速就可以防止出现traffic accident撞死M，因此不会使得情况变得更糟，削弱了

如果M不能从背景声音中区分出boat在不同速度下的声音，也就是说速度快慢产生的sounds对于M来说没有意义，反正不管什么速度他都听不见，那么减速就可以防止出现traffic accident撞死M，因此不会使得情况变得更糟，削弱了

In polluted environments, dolphins gradually accumulated toxins in their body fat, and the larger the dolphin, the more accumulated toxin it can tolerate.  Nearly 80 percent of the toxins a female dolphin has accumulated pass into the fat-rich milk her nursing calf ingests.  Therefore, the unusually high mortality rate among dolphin calves in the industrially contaminated waters along Florida’s Gulf
                Coast is probably the result of their being poisoned by their mother’s milk.

文章说dolphines会在fat里面积累toxin，幼崽喝母乳的时候能喝掉80%的toxin in the fat of their moms，所以小海豚喝得越多死的越难看~结论：FGC的海豚幼崽死亡率高就是因为被妈妈的奶水毒死了

A.      The survival rate of firstborn dolphin calves in the area along Florida’s Gulf
                            Coast is highest for those whose mothers were killed before they were weaned.
                    

断奶以前妈妈就killed的幼崽存活率高，正确，因为喝的少了嘛，喝进去的toxin也少了。支持了结论

B.      The rate at which adult dolphins living in the waters along Florida’s Gulf
                    Coast accumulate toxins is no higher than that of adult dolphins in comparably polluted waters elsewhere.
                

别的地方的海豚无关，结论只讨论在FGC的海豚

别的地方的海豚无关，结论只讨论在FGC的海豚