Humpback whales are sometimes called performers of the ocean.This is because they can make impressive movements when they dive.The name"humpback",which is the common name for this whale,refers to the typical curve shape the whale's back forms as it dives. Sometimes the humpback will dive with a fantastic movement,known as a breach.During breaching the whale uses its powerful tail flukes to lift nearly two-thirds of its body out of the water in a giant leap.A breach might also include a sideways twist with fins stretched out like wings,as the whale reaches the height of the breach. A humpback whale breathes air at the surface of the water through two blowholes which are located near the top of the head.It blows a double stream of water that can rise up to 4meters above the water. The humpback has a small dorsal fin located towards the tail flukes about two-thirds of the way down its back.Other distinguishing features include large pectoral fins,which may be up to a third of the body length,and unique black and white spots on the underside of the tail flukes.These markings are like fingerprints:no two are the same. Humpback whales live in large groups.They communicate with each other through complex"songs". | Quick Facts | |
Size: | 14m~18m in length 30~50tons in weight | |
Living | Open ocean and shallow coastline waters | |
Environment: | From warm tropical (热带的) waters,where they breed,to cold polar waters,where they eat. | |
Diet: | Shellfish,plants and fish of small size | |
Hunting: | Sometimes in groups,in which several whales form a circle under the water,blowing bubbles that form a"net"around a school of fish.The fish are then forced up to the surface in a concentrated mass. | |
Current state: | endangered; it is estimated that there are about 5000~7000humpback whales worldwide. |
分析 本文是一篇科普文,主要讲了座头鲸名字的由来和生活习性等.
解答 69.B 细节理解题.根据文章右栏中的Environment中的内容"From warm tropical (热带的) waters,where they breed,to cold polar waters,where they eat."可知,humpback whale在热带水域繁殖,在寒带水域中觅食,故选B.
70.A 细节理解题.根据文章第二段中的内容"Sometimes the humpback will dive with a fantastic movement,known as a breach.During breaching the whale uses its powerful tail flukes to lift nearly two-thirds of its body out of the water in a giant leap"可知,有时驼背鲸在潜水时会有种意想不到的动作,称为"突破".在"突破"时,座头鲸会用它强有力的尾巴将自己身体的三分之二在一个飞跃到水的外面,故选A.
71.A 细节理解题.根据文章第四段"The humpback has a small dorsal fin located towards the tail flukes about two-thirds of the way down its back.Other distinguishing features include large pectoral fins,which may be up to a third of the body length,and unique black and white spots on the underside of the tail flukes.These markings are like fingerprints:no two are the same."可知,座头鲸有一个较小的背鳍,大概是背部三分之二靠近尾部的地方.它其他的特征还包括大的胸鳍,总长有全部身体的三分之一长,以及在尾鳍下方有一些特殊的黑与白的点.这些的特点有些像指纹那样.没有两条的驼背鲸有同样的标记.A项说法正确,B项错误;由第一段"The name"humpback",which is the common name for this whale,refers to the typical curve shape the whale's back forms as it dives"可知,起这个名字是因为当它要潜入水中时,会将背部提到一种典型的曲线形状,C项错误和"Humpback whales are sometimes called performers of the ocean",驼背鲸有时称为海洋的表演者,D项说法错误,故选A.
点评 解答细节理解题时,一个常用的方法就是运用定位法,即根据题干和选项中的关键词从原文中找到相关的句子,与选项进行比较从而确定答案;推理判断题既要求学生透过文章表面文字信息推测文章隐含意思,又要求学生对作者的态度、意图及文章细节的发展作正确的推理判断,力求从作者的角度去考虑,不要固守自己的看法或观点.
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