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    Dolphins are not fish. They are mammals (哺乳动物).They live in groups and speak to each other in their own language. But they are quite different from almost all land animals. Their brain(大脑)is as big as men's and they live a long life at least 20 or 30 years.
    Like some animals, dolphins use sounds to help them find their way around. They also use these sounds to talk to each other and to help them find food. They do not use their ears to receive sounds,but use the jaw--the lower part of the mouth.
    It is strange that dolphins are friendly to men, and for thousands of years, there are many stories about dolphins and men. In the 19th century, in a dangerous part of the sea near New Zealand,there was a dolphin. The seamen liked him very much and gave him a very good name, Jack. From 1871 to 1903 ,Jack met every boat in the area and showed it the way. In 1903 a passenger on a boat with the name of The Penguin shot and hurt Jack. Luckily the dolphin didn't die, and after a long time he was well again. He guided the ships through the area for nine more years, but he refused to help the boat of the Penguin.
    Today, some people still kill dolphins, but many countries in the world now protect them. In these places, people are not allowed to kill them.
    小题1:The word "jaw" means_________in Chinese.
    A．下颚B．嘴巴C．嘴唇D．鼻子
    小题2:How do dolphins find their way?
    A．They use their noses to smell the way.
    B．They use their ears to hear the sounds.
    C．They use their eyes to see the way.
    D．They use sounds to find the way.
    小题3:Who was Jack?
    A．The writer.B．A dolphin.C．A seaman.D．The passenger.
    小题4:The dolphin guided the ships for about________.
    A．32 yearsB．9 yearsC．41 yearsD．23 years
    小题5:According to the passage, which of the following is NOT right?
    A．Dolphins are not fish.
    B．Dolphins don't live in groups.
    C．Dolphins are kind and friendly to people.
    D．Dolphins can live a long life.

    小题1:A
    小题2:D
    小题3:B
    小题4:C
    小题5:B

    小题1:词义理解推断题，根据文中语句“They do not use their ears to receive sounds, but use the jaw--the lower part of the mouth.”理解可知。
    小题2:细节理解题，根据文中语句“Like some animals, dolphins use sounds to help them find their way around.”理解可知。
    小题3:细节理解题，根据文中语句“In the 19th century, in a dangerous part of the sea near New Zealand,there was a dolphin. The seamen liked him very much and gave him a very good name, Jack.”理解可知。
    小题4:细节理解题，根据文中语句“From 1871 to 1903 ,Jack met every boat in the area and showed it the way. 和He guided the ships through the area for nine more years,”理解可知。
    小题5:细节理解题，根据文中语句“.They live in groups and speak to each other in their own language.”理解可知。
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