rc
定位，一句话解题：
but population ecologists had usually considered viral disease to have contributed to the decline once it was underway rather than to have initiated it.
rc
b引入他因；
且他因是前面premise的否定，这在rc中的逻辑分析是可以且常见的。直接否定了“opulation ecologists' attempts to alter cycles by changing the caterpillars' habitat but failed”
说了“New experiments in which the habitats of lepidoptera are altered（ in previously untried ways） result in the shortening of lepidoptera population cycles.”
rc
定位关键词“ mortality，measure”题干
The common approach of studying causes of population cycles by measuring the mortality caused by different agents, such as predatory birds or parasites,
rc
主旨题，
一个现象，提出假设“选项：present a hypothesis about the driving force behind population cycles in lepidoptera”
第一段总结句In short, the evidence implies that these insect populations, if not self-regulating, may at least be regulated by an agent more intimately connected with the insect than are predatory birds or parasites.
第二段“may be”---Recent work suggests that this agent may be a virus。
最后一段One of the attractions of this hypothesis is its broad applicability.
rc
a.give an example of how the nature of amber has been misunderstood in the past举出一个琥珀在之前如何被误解的例子：P的看法是正确的，没有误解琥珀。
b.point out an exception to a generalization about the history of people's understanding of amber指出一个 在人们对琥珀的理解中的例外：P与世人认为的不一样，所以是一个例外
不要看到give an example就去选，都有很多陷阱，问的是poliny一个提出正确观点的人；所以看选项一定要看全，尤其是后半句，不要只根据前面的几个词定性
破折号是一个很神奇的符号，身后的内容既可以修饰一个词，也可以修饰一个句子。在本题中，破折号身后加上用that引导的从句（修饰词）或者省略这个that（修饰句子）都是可以接受的。
C选项：so that their numbers were greatly reduced是结果状语从句，但其是被动语态，语义上约等于：某人或某物下降了我们祖先的数量。
我们的祖先遭受到了一个事件，如此以至于，某人或某物下降了我们祖先的数量。
划线的两句话之间没有了因果关系。（肯定应该是，遭受事件，如此以至于，这件事下降了数量）
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我有一个疑问，A选项这里比较对象many species of dinosaur 和a warm-blooded mammal’s (metabolism), a cold-blooded reptile’s(metabolism)为什么是一致的呀
我觉得 这里平行的对象应该是metabolism 和a warm-blooded mammal’s (metabolism), a cold-blooded reptile’s(metabolism)