rc
EXCEPT题 注意；原文没提的选项，不要做多余假设
D选项：正确。数量正在下降的是最有可能立刻灭绝的：原文没提。
另：排除法
An endangered population is always rare(A), almost always small(B), and, by definition, under constant threat of extinction(C) even without a proximate cause in human activities(E).---->D
rc
a错，看清楚文中"amphibian crisis," which, in their view, is an indicator of general 是他们的观点，不是author的观点！“ the author believes ”
错选d，作者说的是“the amphibian extinctions”，而d是在说An endangered population。而且跟文中说法词汇太相似的基本都是错的chance events，一定要经过变形，不要脑子一热就去选
constitute 构成
e对，第一段以后一直在讲的就是the amphibian extinctions 并不 clearly constitute evidence of general environmental degradation.
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.
emm 我觉得BD选B的原因是 weather conditions that cannot be foreseen其实是大于weather conditions that are not foreseeable的，更合理的说法是所有没有被预测到的天气，都是造成问题的原因，而不仅仅只是具有不可预测性的天气
Among the surest indications on Earth of sunspot cycles is believed to be the rate at which trees grow
=the rate at which trees grow is believed among the surest indications of sunspot cycles on Earth
扫描二维码，直接登录
rc
suppresses 抑制压制