不懂不懂，解救！

xiangmingliu08

In a certain wildlife park, park rangers are able to track the movements of many rhinoceroses because those animals wear radio collars. When, as often happens, a collar slips off, it is put back on. Putting a collar on a rhinoceros involves immobilizing the animal by shooting it with a tranquilizer dart. Female  rhinoceroses that have been frequently recollared have significantly lower fertility rates than uncollared females. Probably, therefore, some substance in the tranquilizer inhibits fertility.

一道evaluation的题。
正解是：How often park rangers need to use tranquilizer darts to immobilize rhinoceroses for reasons other than attaching radio collars.
实在是不懂题目是什么意思。求解！！

好人必有好报！！

dengts

please paste the whole problem,including all 5 choices...

dengts

example:
GWD-TN-18-Q28,求大神解答啊。。。3x!

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?
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.
为什么选E啊？？。。。

xiangmingliu08

example:
GWD-TN-18-Q28,求大神解答啊。。。3x!

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?
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.
为什么选E啊？？。。。

-- by 会员 dengts (2011/4/16 9:18:31)

E是说做了个试验，说明manatees 在正常的噪音情况下都无法辨别出各种不同速度的boats发出的声音，所以即使boats速度变小了也不影响manatees 的听力。不致这么说你听懂了没？不知道分析得对不对？还有就是E与题干更接近，其他界各选项都是无关的。

dengts

OMG,I just give you a example...you'd better paste your problem as I do

xiangmingliu08

OMG,I just give you a example...you'd better paste your problem as I do

-- by 会员 dengts (2011/4/16 9:46:22)

题目要我自己打上来，有点麻烦，就。。。。。懒了

dengts

难道你用的是prep么？如果是的话，你可以随便输几个关键字在论坛里搜索，然后就能搜到别人贴出来的题，再重新复制粘贴贴出来啊

xiangmingliu08

难道你用的是prep么？如果是的话，你可以随便输几个关键字在论坛里搜索，然后就能搜到别人贴出来的题，再重新复制粘贴贴出来啊

-- by 会员 dengts (2011/4/16 9:49:41)

是的啊，这样欧，谢谢啦！！

xiangmingliu08

难道你用的是prep么？如果是的话，你可以随便输几个关键字在论坛里搜索，然后就能搜到别人贴出来的题，再重新复制粘贴贴出来啊

-- by 会员 dengts (2011/4/16 9:49:41)

真地找到这道题了！！真是感谢啊！！