4. In her love the sea is ___ symbol: to the narrator it clearly represents everything that is destructive in nature, but at other times it seems to stand for everything in nature that is serenely beautiful.
A an enduring B an ambiguous C a coherent D an obtrusive E a discrete
5. Despite their extensive efforts to determine the mode of oil ___, scientists still have not ___ the process by which oil is produced.
A dispersion…excluded B synthesis…rejected C creation…investigated
D recovery…condoned E genesis…established
6. Compared with their parties, politicians are ___:they are considerably less enduring than the organizations in which they function.
A ubiquitous B autonomous C fickle D immutable E transitory
解析：
4. 冒号后内容对其前内容起解释作用，可由冒号后内容(或毁灭;或平静)推论空格内容应意指不清或矛盾，因而正确选项为B。答案：B
翻译：她的爱情里海洋是一个模棱两可的符号：对于陈述者而言它显然象征着一切本质上毁灭性的事物，而其他时候它却似乎象征着一切本质上平静美好的事物。
5. 句中their所指即为scientists，由despite和still not可推论出空格2内容应与determine同表肯定，因而可排除AB，而CD中选项2与文意不符，E即为正确选项。答案：E
翻译：尽管科学家做了多方面的努力以确定石油的起源模式，他们至今仍不能确定石油所产生的过程。
6.冒号后内容对其前的内容起解释作用，由冒号后内容(政治家要在韧性上远逊色于他们所效力的组织)可推论出空格内容应与enduring形成反义，因而排除ABD;而E从含义上判断应指事物难于持久而非形容人，因而可排除从而选择C(见参考释义)。答案：C
fickle: marked by lack of steadfastness,constancy, or stability, given to erratic changeableness《W》
characterized by erratic changeableness or instability, especially with regard to affections or attachments; capricious《American Heritage》
transitory: ①tending to pass away : not persistent ②of brief duration : temporary《Webster》
existing or lasting only a short time; short-lived or temporary《American Heritage》
翻译：政治家与其政党相比起来更为嬗变：他们要在韧性上远逊色于他们所效力的组织。
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