9.Along the river banks ofthe Amazon and the Orinocothere lives a bird that swims before it can fly,flies like afatchicken,eatsgreen leave,has the stomach of a cow and has claws on its wings when young.They build their homes about 4.6m above the river,an important feature for the safety of the young.It is called thehoatzin.
In appearance,thebirds of bothsexes  look very much alike with brown on the back and cream and red ontheunderside.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.

21.What is the text mainly about?D
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.
22.Young hoatzins are different from their parents in thatB.
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
23.What can we infer about primitive birds from the text?A
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.
24.Why do hoatzins collect together in smaller groups when the rainy season comes?D
A.To find more food.
B.To protect themselves better.
C.To keep themselves warm.
D.To produce their young.

分析 文章介紹了hoatzin麝雉,這種鳥類的外貌以及生活習(xí)性.

解答 DBAD
21.D 考查文章主題大意.縱觀全文,文章主要講的是hoatzin麝雉,這種鳥類的外貌以及生活習(xí)性.故選D.
22.B  細(xì)節(jié)題.根據(jù)第一段has claws(爪)on its wings when young,和第三段Baby hoatzins have a claw on the leading edge of each wing and another at the end of each wing tip可知,hoatzin在幼年期是有爪子的,而長大學(xué)會(huì)飛之后就沒有了.故選B.
23.A 推理題.根據(jù)第三段第二句話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.得知,關(guān)鍵是primitive"原始的,早期的"的意思,推出有爪子是為了攀爬,故選A.
24.D 細(xì)節(jié)題.根據(jù)最后一段最后一句話they collect together in smaller living units of two to seven birds for producing purposes,得知,在雨季聚集在一起是為了繁殖,故選D.

點(diǎn)評(píng) 考察學(xué)生的細(xì)節(jié)理解和推理判斷能力,做細(xì)節(jié)理解題時(shí)一定要找到文章中的原句,和題干進(jìn)行比較,再做出正確的選擇.在做推理判斷題不要以個(gè)人的主觀想象代替文章的事實(shí),要根據(jù)文章事實(shí)進(jìn)行合乎邏輯的推理判斷.

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