2024年2月13日发(作者:支大纶)以适者生存为话题的英语作文 适者生存 There is no exception to the rule that every organic being naturally increas at so high a rate, that, if not destroyed, the earth would soon be covered by the p
托福阅读专项练习题及答案Naturalists and casual obrvers alike have been struck by the special relationship between squirrels and acorns (the eds of oak trees). Ecologists, though, cannot obrve the energeti
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