Which of the following, if true, would most seriously undermine the validity of the model of El Nino that is presented in the passage?
During some years El Nino extends significantly farther along the coasts of Ecuador and Peru than during other years.
During periods of unusually cool temperatures along the eastern Pacific, an El Nino is much colder than normal.
The normal upwelling of cold water in the eastern Pacific depends much more on the local characteristics of the ocean than on atmospheric conditions.
The variations in the time it takes Rossby waves to cross the Pacific depend on the power of the winds that the waves encounter.
The western boundary of the Pacific basin is so irregular that it impedes most coastal Kelvin waves from heading eastward.
分析:
先弄清题目的意思,是属于哪种题型。题目的意思是一下哪种说法将最大程度削弱文中所谈预测厄尔尼诺的模型的有效性?,通过题目的意思,我们知道这道题属于weaken题型。之所以会问这样的weaken的问题,那么,文中一定有相应的叙述。
文中的定位是:Taking months to traverse the Pacific, Rossby waves march to the western boundary of the Pacific basin, which is modeled as a smooth wall but in reality consists of quite irregular island chains, such as the Philippines and Indonesia.即说西海岸在模型中被描绘为光滑的墙,但实际上包含很多不规则的岛屿,如菲律宾和印尼这些国家。此处做了一个假设:该模型的设想和真实的地理环境的差异是不影响模型有效预测厄尔尼诺现象的。想要weaken原结论,就应该将漏洞暴露出来,根据选项,如果岛屿过多,阻止了K波返回,则不能形成反馈机制,也就不能形成EI Nino现象。这个前提也正是E选项所表达的,所以正确选项是E.
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