题目内容
12．Dolphins are not fish，but warmblooded animals．They live in groups，and speak to each other in their own language．In this way they are like other animals，such as bees and birds．But dolphins are very different from almost all land animals．Their brain is nearly the same size as our own，and they live a long time-at least twenty or thirty years．Like some other animals，dolphins use sound to help them find their way around．They also make these sounds to talk to each other and to help them find food．We now know they do not use their ears to receive these sounds，but the lower part of the mouth，called the jaw．
Strangely，dolphins seem to like man，and for thousands of years there have been stories about the dolphin and its friendship with people．There is a story about sailors in the 19th century．In a dangerous part of the sea off the coast of New Zealand，they learnt to look for a dolphin called Jack．From 1871to 1903 Jack met every boat in the area and showed it the way．Then in 1903 a passenger on a boat called the Penguin shot and wounded（伤害）Jack．He recovered and for nine years more continued to guide all ships through the area-except for the Penguin．
Today，some people continue to kill dolphins，but many countries of the world now protect them and in these places it is against the law to kill them．
29 Dolphins are different from many other animals in that theyB．
A．live in groups
B．have large brains
C．are warmblooded
D．have their own language
30 Why did the sailors off the coast of New Zealand look for Jack？D
A．He was lonely and liked to be with people．
B．They enjoyed playing with him．
C．He was seriously wounded．
D．They wanted his help．
31 By telling the story of Jack the writer wanted to show thatA．
A．dolphins are friendly and clever
B．people are cruel to animals
C．Jack is different from other dolphins
D．dolphins should be protected by law．
分析 本文介绍了海豚的情况，并举例说明海豚是人类的朋友．
解答 29．B 细节理解题．由第一段第五句Their brain is nearly the same size as our own，可知海豚与其他动物最大的不同就是他们的脑子和人类的脑子几乎一样大，故选B．
30．D 细节理解题．由第三段Jack met every boat in the area and showed it the way．可知海员们寻找Jack的原因是Jack为这些航船在危险航段指明方向，故选D．
31．A 写作意图题．全文都在讲海豚的聪明与友好，所以正确答案是A；其他三个选项不能涵盖全文，只是文章的一个细节．
点评 以细节题的考查为主，要求考生准确阅读文章，在确定考查内容所在文章位置的时候，要根据上下文的语义串联来确定答案．
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