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.

1.The word "jaw" means_________in Chinese.

2.How do dolphins find their way?

3.Who was Jack?

4.The dolphin guided the ships for about________.

5.According to the passage, which of the following is NOT right?

根据短文内容，用方框中所给词语的适当形式填空，使文章通顺、完整。（每词限用一次）

 Long ago, there lived a learned man in Greece. He was well-known               (76) his wide knowledge. And lots of people from all over the country came to               (77) things from him. The great man taught his students with all his heart and               (78) their questions with great patience.

One day a student               (79) him, “My dear teacher, didn’t you say you have many more questions than we do? But we think we students have a lot more than you.” With a               (80), the teacher drew two circles — one is as               (81) as a big plate (盘子), and the other smaller.

“Of course, I’ve learned much more. But I don’t think I know all you know. Now, look at these two circles. Inside the big one is my knowledge of things,               (82) inside the smaller one yours. Out of the circles is what we don’t know. My circle is larger, so its line is longer. That               (83) I have more opportunities to meet with what we don’t know. And that’s               (84) I myself have more questions than you do. The more you learn, the more               (85) you’ll have. You will never learn enough, you know.”

根据短文内容，用方框中所给词语的适当形式填空，使文章通顺、完整。（每词限用一次）

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.