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.

　　1．What is the text mainly about?

　　A．Hoatzins in dry and rainy seasons.

　　B．The relatives and enemies of hoatzins.

　　C．Primitive birds and hoatzins of the Amazon.

　　D．The appearance and living habits of hoatzins.

　　解析：通读全文可知，本文主要介绍了麝雉的外形和生活习性。

　　答案：D

　　2．Young hoatzins are different from their parents in that ________.

　　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

　　解析：由第三段首句及该段末句可知，这种鸟幼年时翅膀上有爪子，成年后就没有了。这便是这种鸟的幼鸟与其父母的不同之处。

　　答案：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.

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