GMAT阅读真题!GMAT阅读复习中，大家也可以多进行一些真题的练习，这样能够辅助我们更好的了解自己备考中的不足，逐一攻克备考难点，拿到阅读部分的高分。下面小编为大家整理了详细的内容，供大家参考!
There are recent reports of apparently drastic declines in amphibian populations and of extinctions of a number of the world’s endangered amphibian species. These declines, if real, may be signs of a general trend toward extinction, and many environmentalists have claimed that immediate environmental action is necessary to remedy this “amphibian crisis,” which, in their view, is an indicator of general and catastrophic environmental degradation due to human activity.
To evaluate these claims, it is useful to make a preliminary distinction that is far too often ignored. A declining population should not be confused with an endangered one. An endangered population is always rare, almost always small, and, by definition, under constant threat of extinction even without a proximate cause in human activities. Its disappearance, however unfortunate, should come as no great surprise. Moreover, chance events-which may indicate nothing about the direction of trends in population size-may lead to its extinction. The probability of extinction due to such random factors depends on the population size and is independent of the prevailing direction of change in that size.
For biologists, population declines are potentially more worrisome than extinctions. Persistent declines, especially in large populations, indicate a changed ecological context. Even here, distinctions must again be made among declines that are only apparent (in the sense that they are part of habitual cycles or of normal fluctuations), declines that take a population to some lower but still acceptable level, and those that threaten extinction (e.g., by taking the number of individuals below the minimum viable population). Anecdotal reports of population decreases cannot distinguish among these possibilities, and some amphibian populations have shown strong fluctuations in the past.
It is indisputably true that there is simply not enough long-term scientific data on amphibian populations to enable researchers to identify real declines in amphibian populations. Many fairly common amphibian species declared all but extinct after severe declines in the 1950s and 1960s have subsequently recovered, and so might the apparently declining populations that have generated the current appearance of an amphibian crisis. Unfortunately, long-term data will not soon be forthcoming, and postponing environmental action while we wait for it may doom specie and ecosystems to extinction.
1、The primary purpose of the passage is to
A.assess the validity of a certain view
B.distinguish between two phenomena
C.identify the causes of a problem
D.describe a disturbing trend
E.allay concern about a particular phenomenon
正确答案: A
主旨题
第一段抛出一些陈述，第二段开头，to evaluate these claims，表明作者态度及目的，evaluate与正确选项中assess相对应
以上就是关于“GMAT阅读真题”的内容，相信大家对接下来的备考内容，有更清晰的了解。GMAT考试成绩的高分，并不是一蹴而就的，大家还是需要踏踏实实的练习备考，才能真正的提升我们的分数。
