阅读的最大障碍恐怕就是长难句了。给大家列出几个超级复杂的长难句，请大家注意解析句子结构的关键点。希望能对大家的GRE复习有所帮助。
句子1：
It was possible to demonstrate by other methods refined structural differences among neuron types;however, proof was lacking that the quality of the impulse or its condition was influenced by these differences, which seemed instead to influence the developmental patterning of the neural circuits.
主干: demonstrate refined structural differences was possible
翻译: 有可能通过其他方法来证明神经元种类间的细微的结构差异；可是, 这样的证据是缺乏的, 即神经冲动的性质或者状态是受这些差异所影响的, 而这些差异看起来却能影响神经网络的发育模式。
1.was真正主语（非形式主语）是: ：
A other methods
B To demonstrate
C Neuron types
答案：B
2.the quality of the impulse or its condition was influenced by these differences这个从句以下哪个是正确的: ：
A 定语从句, 修饰proof
B 同位语从句, 可以替代proof
C 状语从句, 修饰lacking
答案：B
3.which seemed instead to influence the developmental patterning of the neural circuits修饰的是: （这个问题有待讨论）：
A Methods
B Proof
C These differences
答案：C
句子 2：
One such novel idea is that of inserting into the chromosomes of plants discrete genes that are not a part of the plants’ natural constitution: specifically, the idea of inserting into no leguminous plants the genes, if they can be identified and isolated, that fit the leguminous plants to be hosts for nitrogen-fixing bacteria. Hence, the intensified research on legumes.
主干: such novel idea is that of 结构
翻译: 这其中的一个新颖思想就是, 在植物的染色体（chromosome）内注入并非是该植物自然构造一个部分的那些不相关联的因基: 具体而言, 这一思想是, 在非豆科植物内注入这样一些基因, 倘若这些基因可被辨识出来并被分离开来, 而这些基因业已使豆科植物宜于充当那些具备固氮作用的细菌的寄主。由此, 对豆科植物的研究日趋深入。
1.第一个that后面省略了下面那个词: ：
Aidea
Bchromosomes
Cgenes
答案：A
2.inserting的宾语是: ：
A Chromosomes
B Plants
C Genes
答案：C
3.第二个that指代的是: ：
A Idea
B Constitution
C Genes
答案：C
