gwd29-35,9

good-will

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

 

1. the number of days with heavy rainfall was lower in 1990 than in 1910
2. the number of days with some rainfall, but no more than two inches, was the same in 1990 as in 1910
3. the number of days with some rainfall, but no more than two inches, was higher in 1990 than in 1910
4. 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
5. the average amount of rainfall per month was lower in 1990 than in 1910

不太明白,怎么也选不出作为正确答案的a...,看来看去在这五个选项中找不出正确的答案...请大家帮忙

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?

 

1. 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.
2. 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.
3. 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.
4. The sound of a boat engine generally travels much further under water than it does through the air.
5. 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.

大家看看b可不可以,答案e好在哪里?

sinadragon

Q35: The question is asking the possibility.

amount of day doesnot mean the amount of rain

If one day rains the heaviest rain in this century than the result listed in the arg is possible ,too

Hence A is the answer.A is possible.

sinadragon

Q9: B talks about the effect on manatees' food supply.  The conclusion concerns the collision problem.  B is out of the scope.

The conclusion is: boats slow down => sound lowers => manatees can't hear boats
E: manatees can't hear boats anyway, sound is not a factor that we should consider when evaluating the proposal

good-will

very clear ,thanks you very much!