28.(1) 211(2分)10H2O(2)①0.1(2分)②145.8p(2分)③>(2分)(3)升高温度有利于反应向吸热方向进行且反应速率加快;丁烯高温裂解生成短链烃类(各2分(4)①第一步(1分)②生成物M的能量较低,物质稳定(1分)
【语篇导读】本文主要介绍了研究发现几百万年前,蜘蛛就从非洲漂洋过海来到澳洲。12.B【解析】细节理解题。根据第一段l' s easy tothink that the globe's vast oceans would be effectivebarriers to the movement of land animals.可知,人们认为陆地动物不可能跨越海洋13.C【解析】词义猜测题。根据第一段tμ poor(活板门) spiders made such a journeymillions of yearsago.可知,活板门蜘蛛几百万年前就开始了跨越海洋之旅,由此可知此处的them指代的就是蜘蛛。14.A【解析】细节理解题。根据第四段 To figure outwhich story was most likely true, Harrison and his colleagues looked at the spiders’ genes.可知,科学家通过基因对比得知澳洲蜘蛛和非洲蜘蛛起源于同一个祖先。15.D【解析】主旨大意题。根据文章内容,特别是第段中 But it turns out that plenty of plants and animals have unintentionally foaled across oceans from onecontinent to another.可知,本文主要介绍了几百万年前,蜘蛛就从非洲漂洋过海来到澳洲。
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