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难点(八) “戴着面纱”的“事实”型细节理解题 该题型的难点在于文章提供的信息量大，考生在提取文中有效信息时容易出现失误，从而误判乃至误选答案。 Why do hoatzins collect together in smaller groups when the rainy season comes? A．To find more food. B．To protect themselves better. C．To keep themselves warm. D．To produce their young. (2010·新课标全国卷Ⅰ，C) Along the river banks of the Amazon and the Orinoco there lives a bird that swims before it can fly，flies like a fat chicken，eats green leaves，has the stomach of a cow and has claws (爪) on its wings when young.They build their homes about 4.6 m 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. During the drier months between December and March hoatzins fly about the forest in groups of 20 to 30 birds，but in April，when the rainy season begins，they collect together in smaller living units of two to seven birds for producing purposes. When danger comes in the form of a snake or a monkey，the young hoatzins—maybe three in one family—jump over the side and into the river.They swim about under the water until it is safe to return and then，using their claws，lift themselves up through the branches and get back home.When they have learned to fly they lose their claws and escape enemies not by swimming but by flying off，in a slow and heavy way，to a neighboring tree. [语篇解读] 这是一篇说明文，介绍生活在南美的亚马逊河流域的一种叫hoatzin的鸟，介绍其身体特征和生活习性。 | 
