A．they look like young cuckoos

　　B．they have claws on the wings

　　C．they eat a lot like a cow

　　D．they live on river banks

　　答案　B　[细节理解题。根据第三段的第一句Baby hoatzins have a claw on the leading edge of each wing and another at the end of each wing tip.与此段的最后一句When the young hoatzins have learned to fly, they lose their claws.可知幼鸟有爪子而老一些的鸟没有。故选B。]

　　3．What can we infer about primitive birds from the text?

　　A．They had claws to help them climb.

　　B．They could fly long distances.

　　C．They had four wings like hoatzins.

　　D．They had a head with long feathers on the top.

　　答案　A　[推理判断题。根据第三段的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.可知最初的鸟用爪子帮助爬行。故选A。]

　　4．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.

　　答案　D　[细节理解题。根据最后一段的when the rainy season begins, they collect together in smaller living units of two to seven birds for producing purposes.可知。]

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