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: 主旨大意题。本文第一段说,在亚马逊河流域有一种鸟,先学会游泳后学会飞翔,第二段说它们的外表,第三段叙述这种鸟从幼鸟到学会飞翔的蜕变,第四段讲述其生活特性,即在每年的12月到3月以及4月份雨季来临时它们的生活习性。从这些叙述看,本文的主题是D,介绍这种叫hoatzin的鸟的外表和生活习性。B项“hoatzin的天敌与亲戚”在本文没有提到,A项“在雨季和干燥季节的hoatzin”;C项“亚马逊的原始鸟与hoatzin”都是文章的部分内容。 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: 事实细节题。第三段说,幼小的hoatzin在其每只翅膀的顶部边缘有一只脚爪,而且每只翅膀的顶部末端还有一只脚爪,它们靠这四只脚爪和喙攀爬,等它们学会飞翔之后,这些脚爪就消失了。由此判断B项正确,成年hoatzin与幼小的hoatzin的区别是,幼鸟在翅膀上有脚爪。 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. 解析: 推理判断题。第三段说,hoatzin的幼鸟用四只脚爪和喙在灌木丛中攀爬。由此推断,幼鸟的脚爪是用来帮助其攀爬的。 答案: A 4.Why do hoatzins collect together in smaller groups when the rainy season comes? A.To find more food.
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