3.B由等差数列的性质可知a1+a10=a3+ag=12,则So10=12×5=60

本文是一篇说明文。文章主要介绍了一种不起眼的小鱼其数量远超其捕食者,由此引起了生态系统的巨大变化。【答案与解析】28.A推理判断题,根据第一段“ A little fish that many people ignore is having a dramatic ecological impact,”可知,这种小鱼是一种非常不起眼的物种。由此可推断,它们能够影响到整个生态圈这件事可能是人们意想不到的。29,C细节理解题,根据第二段“ To find out what was going on, the researchers unearthed I3,000 surveys on fish donebetween179and2017.,”可知, Johan Eklof和他的同事是通过研究以往的相关数据来查找引起这种巨大变化的原因30.B词义猜测题。根据第三段“ Those fish covered in the fresher waters8 kilometers closer to shore. But in the 190的sticklebacks began to outnumber their enemies closer to land, their dominance(it) spreading toward more protectedbays and inland waters.”可知,此处画线词的意思与 Occupied最为相近31.D推理判断题,根据最后一段“,, How politicians and managers respond to the result of this study"is important toour planet’,"可推断,政府的官员们应该重视这项研究结果

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