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标题: 请教一下 [打印本页]

作者: jdxf 时间: 2007-5-3 03:02
标题: 请教一下

答案E做何解呢？

为什么不选B？

28: 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.
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.

作者: jdxf 时间: 2007-5-3 09:52
竟然也没人回答啊

作者: julianfl 时间: 2007-5-3 10:33

http://forum.chasedream.com/dispbbs.asp?boardID=24&ID=148452&page=3

http://forum.chasedream.com/dispbbs.asp?boardID=24&ID=172792&page=1

http://forum.chasedream.com/dispbbs.asp?boardID=24&ID=148452&page=1

以后如果有比较着急的问题，可以去这个帖子里面，对照题号搜一下。很多都是远古大牛的解释：）嘿嘿。

http://forum.chasedream.com/dispbbs.asp?boardID=24&ID=128827

http://forum.chasedream.com/dispbbs.asp?boardID=24&ID=87513&page=1

作者: jdxf 时间: 2007-5-4 03:29

谢谢！

早点知道就好了。。不过还是很高兴！

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