说客英语带来了TOEFL托福考试真题答案（1），以下为具体内容。

TOEFL托福考试真题答案（1）

　　Naturalists and casual observers alike have been struck by the special relationship  between squirrels and 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 simple. Squirrels may devour many acorns, but by storing and failing to recover  up to 74 percent of them as they do when seeds are abundant, these arboreal rodents  can also aid regeneration and dispersal of the oaks.  Their destructive powers are well documented. According 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 eight thousand acorns, but within weeks of seed maturity,  hardly an 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 are therefore of no benefit to the trees. Flying squirrels, chipmunks, and mice are  also unlikely to promote tree dispersal, as they often store seeds in tree cavities  and underground burrows. Only squirrels —whose behavior of caching (hiding)  acorns below the leaf litter — often promote 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 shells to get at the nutritious inner  kernels,and then discard them half-eaten. The ground under towering 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 such predators as red-tail hawks only to leave a large part of each  acorn uneaten? While research 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.

　　1. What does the passage mainly discuss?

　　(A) The ecology of oak trees

　　(B) Factors that determine the feeding habits of Squirrels

　　(C) Various species of animals that promote the dispersal of tree seeds

　　(D) The relationship between squirrels and oak trees

　　2. The word "they" in line 7 refers to

　　(A) oak forests

　　(B) acorns

　　(C) squirrels

　　(D) predators

　　3. According to the passage , what do squirrels do when large quantities of

　　acorns are available?

　　(A) They do not store acorns.

　　(B) They eat more than 74 percent of available acorns.

　　(C) They do not retrieve all the acorns that they have stored.

　　(D) They hide acorns in tree cavities.

　　4. The word "estimated" in line 11 is closest in meaning to

　　(A) commented

　　(B) judged

　　(C) observed

　　(D) discovered

　　5. 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

　　6. It can be inferred from 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

　　7. According to the passage , which of the following do squirrels and blue jays

　　have in common?

　　(A) They travel long distances to obtain acorns.

　　(B) They promote the reproduction of oak trees.

　　(C) They bury acorns under fallen leaves.

　　(D) They store large quantities of acorns.

　　8. The phrase "pry off" in line 21 is closest in meaning to

　　(A) swallow

　　(B) remove

　　(C) squeeze

　　(D) locate

　　9. The word "littered" in line 22 is closest in meaning to

　　(A) covered

　　(B) displayed

　　(C) fertilized

　　(D) planted

　　10. According to the passage , scientists cannot explain which of the following

　　aspects of squirrel behavior?

　　(A) Where squirrels store their acorn caches

　　(B) Why squirrels prefer acorns over other seeds

　　(C) Why squirrels eat only a portion of each acorn they retrieve

　　(D) Why squirrels prefer acorns from a particular species of oak trees

　　ANSWER KEYS  PASSAGE 98 DCCBD DBBAC

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