Need some help on TOEFL reading 09/2002

[motlanchomaisau]

Hi everyone.
When I do the 09/2002 reading section, I can't explain why my answers don't fit with the answers in my online resource. Can anyone explain it for me?
This is the reading passage:

Naturalists and casual observers alike have been struck by the special relationship between squirrels an acorns (the seeds of oak trees). Ecologists, though, cannot observe. These energetic mammals scurrying up and down oak trees and eating and burying acorns without wondering about their complex relationship with trees. Are squirrels dispersers and planters of oak forests or pesky seed predators? The answer is not simp. Squirrels may devour many acorns, but by storing and failing to recover up to 74 percents of them (as they do when seeds are abundant), these arboreal erodent can also aid regeneration and dispersal of the oaks.
Their destructive powers are well documented. Accorring to one report, squirrels destroyed tens of thousands of fallen acorns from an oak stand on the University of Indiana campus. A professor there estimated that each of the large white oaks had produced between two and eght thousand of acorns, but within weeks of seed maturity, hardly and intact acorn could be found among the fallen leaves.
Deer, turkey, wild pigs, and bears also feed heavily on acorns, but do not store them, and therefore of no benefit to the trees. Flying squirrels, chipmunks, and mice are also unlikely to promote tree dispersal - whose behavior of caching (hiding) acorns below the leaf litter often promotes successful germination of acorns - and perhaps blue jays, important long-distance dispersers, seem to help oaks spread and reproduce.
Among squirrels, though, there is a particularly puzzling behavior pattern. Squirrels pry off the caps of acorns, bite through the shell to get at the nutritious inner kernels, and then discard them half-eaten. The ground under towing oaks is often littered with thousands of half-eaten acorns, each one only bitten from the top. Why would any animal waste so much time and energy and risk exposure to suck predators as red-tail hawks only to leave a large part of each acorn uneaten? While reasearch is not conclusive at this point, one thing that is certain is that squirrels do hide some of the uneaten portions, and these acorn halves, many of which contain the seeds, may later germinate.


I have difficulty at question number 45 and 46:

45. Why does the author mention "the University of Indiana campus" in line 10-11?
A/ To provide evidence that intact acorns are hard to find under oak trees.
B/ To indicate a place where squirrels can aid seed dispersal of oaks.
C/ To argue in favor of additional studies concerning the destructive force of squirrels.
D/ To support the claim that squirrels can do great damage to oak stands.

46. It can be inferred from the paragraph 3 that chipmunks do not aid in the dispersal of oak trees because:
A/ They store their acorns where they cannot germinate
B/ They consume most of their stored acorns.
C/ Their stored acorns are located and consumed by other species.
D/ They cannot travel the long distance required for dispersal.

From my resource, the answer for question 45 is C, and for question 46 is A, but in my opinion, I choose both of them D.
Can you judge for me?

[ltoeyl]

In my opinion, no. 45, I choose c also because the sentence
"Accorring to one report, squirrels destroyed tens of thousands of fallen acorns from an oak stand on the University of Indiana campus" is mentioned to support the reson that squirrels damaged trees.

No. 46 I'm not sure about the answer, but D is not mension in the paragraph ^^ .

[gamepc]

In my opinion, the answer of the two questions are C and A respectively. When you try to delete each choice, the best answer of each question is C and A. Choice D of question 45 contrast with the context and choice D of question 46 is no mention in the passage.