| Ecologist: The scottish highlands were once the site of extensive of forests, but these forests have mostly disappeared and been replaced by peat bogs.The common view is that the highlands' deforestation was caused by human activity, especially agriculture. However, agriculture began in the highlands less than 2000 years ago. Peat bogs, which consist of compressed decayed vegetable matter, build up by only about one foot per 1000 years and, throughout the highlands, remanis of trees in peat bogs are almost all at depth greater then four feet. Since climate changes that occurred between 7000 and 4000 years ago favored the development of peat bogs rather than the survivals of forests, the deforestation was more likely the result of natural process than of human activity.
the above two boldface play which of the following role in the argument?
A. the first is evidenc that has been used in support of a position that the ecologist rejects; the second is a finding that the ecologist used to counter that evidence.
B.The first is a evidence that, in light of the evidence provided in the second, serves as grounds for the ecologist's rejection of a certain position.
C. the first is a position that the ecologist rejects；the second is evidence that has been used in support of that position.
D. The first is a position that the ecologist rejects; the second provides the evidence in support of that rejection.
E. the first is a position for which the ecologist argues; the second provides evidence to support that position.
参考答案为A,
不明白阿，为什么会是A | 
