Step 3:转义概括,或取其一
全文说明了最新的研究成果——鱼类为什么节食。文章第一段中先以人为对比,引出鱼类节食这个话题,然后指明这是最新的研究成果。因此可以推断,在随后的几个段落里,作者要对这个发现进行说明,故文章全篇应是关于鱼类节食的。D项简洁明了,概括了文章大意。
【经典有约】
Along the river banks of the Amazon andthe Orinoco there lives a bird that swims beforeit
can fly,flies like a fat chicken,eats green leaves,has the stomach of a cowand has claws(爪)on itswings when young.They build their homes abou
4.6m above the river,an important feature(特征)for the safety of the young.It is called the hoatzin.
In appearance,the birds of both sexes look very much alike with brown on the back and cream and red on the underside.The head is small,with a large set of feathers on the top,bright red eyes,and blue skin.Its nearest relatives
are the
common
birds,cuckoos.
Its most striking feature,though,is only found in the young.
Baby hoatzins have a claw on the leading edge of each wing and another at the end of each wing tip.Using these four claws,together with the beak(喙),they can climb about in the bushes,looking very much like primitive birds must have done.When the young hoatzins have learned to fly,they lose their claws.
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