第一节（共4小题；每小题6分, 满分30分）
Many people say dolphins are very intelligent.They seem to be able to think, understand, and learn things quickly.But are they smart like humans or more than cats or dogs?Dolphins use their brains differently from people.But scientists say dolphin intelligence and human intelligence are similar in some ways.How?
Fact 1：Talk to me
Like humans, every dolphin has its own "name". The name is a special whistle.Each dolphin chooses a specific whistle for itself, usually by its first birthday.Actually, scientists think dolphins, like people, "talk" to each other about a lot of things, such as their ages, their feelings, or finding food.And, like humans, dolphins use a system of sounds and body languages to communicate.But understanding their conversations is not easy for humans.No one speaks dolphin's language yet, but some scientists are trying to learn.
Fact 2：Let's play
Dolphins are also social animals.They live in groups, and they often join others from different groups to play games and have fun—just like people.In fact, playing together is something only intelligent animals do.
Fact 3：Fishermen's helper
Dolphins and humans are similar in another way：both make plans to get something they want.In the seas of southern Brazil, for example, dolphins use an interesting strategy（策略）to get food.When fish are near a boat, dolphins show signs to the fishermen to put their nets in the water.Using this method, the men can catch a lot of fish.What is the advantage for the dolphins in doing so?They get to eat some of the fish.
1. What does a dolphin often use as its "name"?
A. A body language.
B. A special whistle.
C. Its feeling.
D. Its age.
2. How do dolphins help fishermen catch fish?
A. By playing with other fish.
B. By following fishing boats.
C. By leading the fish into the net.
D. By showing signs to the fishermen.
3. What is the passage mainly about?
A. Dolphins are smarter than humans.
B. Dolphins make friends with humans.
C. Dolphins teach humans to speak their language.
D. Dolphins and humans are similar in some ways.
【答案】1. B 2. D 3. D
【解析】
【分析】这是一篇说明文。主要讲述海豚是海洋中最聪明的生物，在很多方面，比如交流，玩耍，帮助渔民捕鱼，甚至和人的智慧相似。
【详解】1.细节理解题。根据第二段“Like humans,every dolphin has its own 'name'. The name is a special whistle.”（和人类一样，每只海豚都有自己"名字"。这个名字是一个特殊的口哨。）可知每一只海豚都有代表自己的一种像特别的哨子的声音。故选B项。
2.细节理解题。根据最后一段倒数第三行“When fish are near a boat, dolphins show signs to the fishermen to put their nets in the water.”（当鱼靠近渔船时，海豚会向渔民展示将渔网放入水中的信号）。可知海豚通过发出信号告诉渔夫们撒网的地方。故选D项。
3.主旨归纳题。阅读全文以及根据第一段“Many people say dolphins are very intelligent.They seem to be able to think，understand，and learn things quickly.But are they smart like humans or more than cats or dogs？Dolphins use their brains differently from people.But scientists say dolphin intelligence and human intelligence are similar in some ways.”（很多人说海豚非常聪明。它们似乎能够快速思考、理解和学习事物。但它们是否像人类一样聪明，或者比猫或狗更聪明？海豚使用大脑的方式与人类不同。但是科学家说海豚的智力和人类的智力在某些方面是相似的。"本文通过通过举例说明在某些方面海豚与人类很相像。）。故选D项。
【点睛】说明文的文章结构一般是总分结构。首段给出文章要说明的主旨。之后的段落基本是围绕此主旨展开说明，以支持此观点。所以，主旨大意一般位于首段。此外，从题目入手，抓住关键词，再到文章中去寻找关键词，定位关键信息，是快速准确做题的关键。
