还请NNs指点：GWD29-29、29-35& 32-7

yangliu0401 · 发表于 2009-1-9 12:30:00

GWD-29-Q9

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?

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.
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.
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.
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.

答案是E,偶选的D. 偶不太理解E的后半句话。请NNs指教啊

GWD-29-Q35

In Patton City, days are categorized as having heavy rainfall (more than two inches), moderate rainfall (more than one inch, but no more than two inches), light rainfall (at least a trace, but no more than one inch), or no rainfall. In 1990, there were fewer days with light rainfall than in 1910 and fewer with moderate rainfall, yet total rainfall for the year was 20 percent higher in 1990 than in 1910.

If the statements above are true, then it is also possible that in Patton City

the number of days with heavy rainfall was lower in 1990 than in 1910
the number of days with some rainfall, but no more than two inches, was the same in 1990 as in 1910
the number of days with some rainfall, but no more than two inches, was higher in 1990 than in 1910
the total number of inches of rain that fell on days with moderate rainfall in 1990 was more than twice what it had been in 1910
the average amount of rainfall per month was lower in 1990 than in 1910

答案A，但偶认为A敲好不符合原文意思啊！原文是说1990年下小雨和中雨的天数比1910年的少，但1990年总的雨量要比1910年的多20%。这样推理应该有一下几种可能：

1)1990年下大雨的天数要比1910年的多；

2)1990年下小雨和中雨的天数少，但其每次的雨量都比1910年每次的多很多

所以偶选的D.

GWD32-Q7

Travel agents are market intermediaries who make their living by gathering, organizing, and dispensing information about travel-related services

that is not readily available to most consumers through new information technologies , such as the internet much of this information can now be

made directly available to consumers demand for the services of travel agents will be drastically reduced.

Which of the following ,if true , most seriously weakens the argument ?

A) Travel agents routinely use the internet and other new information technologies as sources for the information they obtain for their customers .

B) The amount of information available through the internet and other new information technologies is increasing faster than the capabilities of

most consumers to process it

C) Many people use travel-related services, such as airlines and hotels without consulting a travel agent .

D) The people who currently use the services of travel agents are also those most likely to gain access to new information technologies

E) The internet and other new information technologies are currently used by a relatively small proportion of the population

答案给的B，可偶觉得D更合适些：D说使用旅行社服务的人群也最有可能接触新科技信息，这就说明了他们还是更偏向使用旅行社的服务，那么就有力削弱了文中章的结论。

还请NNs帮忙指点啊！

[此贴子已经被作者于2009-1-11 6:29:28编辑过]

yangliu0401 · 发表于 2009-1-10 03:37:00

怎么木有人哪

yangliu0401 · 发表于 2009-1-11 06:18:00

自己顶一下啊~

k2o33 · 发表于 2009-1-11 23:43:00

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

传的是很远，不过声音还是有音量不同之分。固体传播声音比液体还快，但太轻了还是听不见。

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.

海牛分辨不出高速声音和低速声音，那么低速就不会比高速更加伤害海牛

In Patton City, days are categorized as having heavy rainfall (more than two inches), moderate rainfall (more than one inch, but no more than two inches), light rainfall (at least a trace, but no more than one inch), or no rainfall. In 1990, there were fewer days with light rainfall than in 1910 and fewer with moderate rainfall, yet total rainfall for the year was 20 percent higher in 1990 than in 1910.

If the statements above are true, then it is also possible that in Patton City

the number of days with heavy rainfall was lower in 1990 than in 1910
the number of days with some rainfall, but no more than two inches, was the same in 1990 as in 1910
the number of days with some rainfall, but no more than two inches, was higher in 1990 than in 1910
the total number of inches of rain that fell on days with moderate rainfall in 1990 was more than twice what it had been in 1910
the average amount of rainfall per month was lower in 1990 than in 1910

这是我见过淫贱的一题，尤其是白种人，几乎肯定做错。（黑种人就放弃吧）

就和我们中小学的数学老师一样，出题时更多考虑学生的思维死角在哪里。

其实只要提示，即使1990年每个级别的降雨天数都比1910年少，可能1990年降雨量还是比1910年大几百倍。

比如，超过2英寸的降雨量1990年就一天，不过下了999999999999999999999英寸，其他moderate rainfall、light rainfall天数都没有；而1910年每天下雨都有2英寸。