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标题: GWD29--9 [打印本页]

作者: jinni 时间: 2006-4-15 12:08
标题: GWD29--9

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.

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.

这道题目B,E都有削弱的意思，感觉E和题意联系得更加密切，

请NN指点，一般如果来从这样的两个选项中分辩哪个更好？

作者: wpm70 时间: 2006-4-15 22:29
b怎么削弱了,我怎么没看出来呢?

作者: amber0919 时间: 2006-5-22 10:30

这题答案给的Ｅ．但我觉得Ｂ好．

Ｂ是削弱．结论在与低速没有解决问题，反而使问题更严重．要削弱这个结论．

Ｂ：高速的船会破坏鱼的事物Ｈ．　（也就是说低速是好的，不会破坏）削弱结论．

Ｅ错．　注意是使鱼接触at various speeds的时候，这些鱼失去了判断sound的能力．文中比较的是低速和高速．　这里的various不对．如果改为高速，还有点削弱的可能．

继续讨论．

[此贴子已经被作者于2006-5-22 10:35:00编辑过]

作者: pumpkin 时间: 2006-5-23 11:59

我选E

噪声背景超过船声

作者: mejor 时间: 2006-7-30 20:30

注意提干让 weaken结论，结论是鱼和船发生事故。B说的食物链，超出讨论范围了。

作者: zhaoyak7 时间: 2006-7-31 00:07

楼上的有道理。偶的体会是做题要把握整体的逻辑意思和紧扣结论：结论是鱼不能分辩声音，包括低的声音，所以还要撞船，船开慢了，噪音低的没用。削弱就是说船开慢了，噪音低了对海牛有用。

偶思路是看到B，先放了一下，但看到E时就把B扔掉了。

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.

E说实验把船的噪音分为不同等级去测试海牛牛（这本身就是紧扣主题），但海牛对超过正常噪声的声音没有分辨力，也就是说海牛对船的低噪音还是能分辨的（这个实验就是按船的声音分级的）正好和题干的a boat’s sound lowers in pitch as the boat slows相对应，即降低船速，从而降低噪声是对海牛保护有用的，削弱了结论

作者: zhaoyak7 时间: 2006-7-31 00:10

再说两句,偶看了题干,第一感觉答案可能是"因为船速低了,即使撞上问题不大,恢复快"之类的东东,没相到答案还是绕了几圈.真麻烦

作者: babypigsxm 时间: 2006-8-12 20:38
UP

作者: jackieli007 时间: 2009-8-10 13:53
~~

作者: bayerner 时间: 2009-8-10 15:45
B看似有联系但是题目主要说的是因碰撞而死，而且没有讨论事物的问题，如果认为B削弱的话多少有点儿interpretation

作者: wlcheer 时间: 2009-12-29 16:49
B 不是削弱，虽然我开始也选b，
要看结论是说慢船也没有什么用，因为分不清低音和boat的音
E 在正常状态下什么因都分不清楚，攻击了理由

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