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 neighbouring tree.

　　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.

　　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

　　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.

　　4．Why do hoatzins collect together in smaller groups when the rainy season comes?

　　A．To find more food.

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