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　　"The greatness of individuals can be decided only by those who live after them, not by their contemporaries."

　　個(gè)體的偉大只能由他/她的后人來(lái)評(píng)判，而不能由他/她同時(shí)代的人來(lái)評(píng)判。

　　Argument：

　　The following is a letter to the editor of an environmental magazine.

　　"Two studies of amphibians in Xanadu National Park confirm a significant decline in the numbers of amphibians. In 1975 there were seven species of amphibians in the park, and there were abundant numbers of each species. However, in 2002 only four species of amphibians were observed in the park, and the numbers of each species were drastically reduced. One proposed explanation is that the decline was caused by the introduction of trout into the park's waters, which began in 1975. (Trout are known to eat amphibian eggs.)"

　　在X國(guó)家公園對(duì)于兩棲動(dòng)物所進(jìn)行的兩次研究證實(shí)了兩棲動(dòng)物數(shù)量的急劇下降。1975年公園中有7種兩棲動(dòng)物，每種的數(shù)量都很豐富。 然而到了202年在公園中只觀察到4種兩棲動(dòng)物，并且每種動(dòng)物的數(shù)量都顯著下降。一種解釋就是兩棲動(dòng)物數(shù)量的下降曾被歸因于始于1975年的在公園水域引入鮭魚(yú)的行為(鮭魚(yú)捕食兩棲動(dòng)物的卵)。

　　Write a response in which you discuss one or more alternative explanations that could rival the proposed explanation and explain how your explanation(s) can plausibly account for the facts presented in the argument.