训练：This is not because such an interpretation necessarily stiffens into a thesis（although rigidity in any interpretation of this or of any novel is always a danger），but because Wuthering Heights has recalcitrant elements of undeniable power that，ultimately，resist inclusion in an all-encompassing interpretation.
65. The isotopic composition of lead often varies from one source of common copper ore to another，with variations exceeding the measurement error；and preliminary studies indicate virtually uniform is topic composition of the lead from a single copper-ore source. (4)铅的同位素构成经常在一种普通铜矿石来源与另一种铜矿石来源之间存在差异，其差异程度超出测量误差；而最初的研究表明，对于来自单独一个铜矿石来源的铅来说，其同位素构成几乎是毫无二致的。
难句类型：复杂修饰、插入语、专业抽象词
解释：本句是一个怪异的现象的典型例子：句子的结构谈不上复杂，所用单词也不难，但是除非读者有理工科的科研（最好是材料科学的科研）背景，否则句子虽然能够得读下来，但是却搞不清句子说的是什么意思。首先，句子中出现的一些词汇虽然也都比较常见，但是在理科文章中出现，就有了专有名词的意味，同时还带有很抽象的学术含义，笔者称之为专业抽象词，如isotopic composition;source;variation;measurement error;preliminary study等。认识这些单词，并不意味着懂得它们在文章的意义和作用。比如说measurement error，大家都可以望文生义地理解成测量错误、测量误差，但是在对文章的阅读中这种字面上的理解是远远不够的。其实此处强调的并不是测量中出现的错误和毛病，而是指那些每次测量都会发生的、永远也无法避免的、在测量值和实际值之间的正常的差异。因此，本句话的真实含义也难以理解。句子只是罗列了一堆事实，而作者真正想说的意思是什么呢？其实variations exceeding the measurement error的言外之意是这些不同variations是真正有意义的不同，而不是试验的误差；那么不同矿源的铜矿的铅同位素成分真的不同，相同的矿源的铅同位素几乎相同，就意味着我们可以通过测量铅同位素的成分来确定铜矿的矿源(挖掘地)。
意群训练：The isotopic composition of lead often varies from one source of common copper ore to another，with variations exceeding the measurement error；and preliminary studies indicate virtually uniform is topic composition of the lead from a single copper-ore source
66. More probable is bird transport，either externally，by accidental attachment of the seeds to feathers，or internally，by the swallowing of fruit and subsequent excretion of the seeds. （3+） 更有可能的是鸟类运输：或者是通过外部途径，即由于种籽偶然粘附在羽毛上；或者是通过内部方式，即由于鸟类吞食果子并随后将种籽排泄出来。
难句类型：复杂修饰、插入语、倒装
解释：句首有一个倒装，正常语序是bird transport is more probable。后面的句子中由于插入部分的频繁出现使句子显得十分凌乱。
意群训练：More probable is bird transport，either externally，by accidental attachment of the seeds to feathers，or internally，by the swallowing of fruit and subsequent excretion of the seeds.
67. A long-held view of the history of English colonies that became the United States has been that England’s policy toward these colonies before 1763 was dictated by commercial interests and that a change to a more imperial policy , dominated by expansionist militarist objectives , generated the tensions that ultimately led to the American Revolution . （4+） |
