Dolphins are not fish. They are animals. 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 is as big as men’s and they have a long life-at least 20 or 30 years.

Like some animals, dolphins use sounds to find their way around. They also use those 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 same 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 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

A．嘴巴                      B．胡须                       C．嘴唇                      D．下鄂

2．How do dolphins find their way?

A．They use sounds to find the way                  B．They use their ears to hear the sounds

C．They use their eyes to see the way               D．They use their brain to hear the sounds.

3．Jack is the name of _______

A．the writer               B．a seaman                 C．a dolphin                 D．a passenger

4．The dolphin guided the ships for about ______

A．32 years                 B．41 years                  C．9 years                   D．40 years

5．According to the passage, we have learned that ________

A．dolphins don’t live in groups

B．dolphins are not a kind of fish

C．dolphins are kind but dislike the humans

D．dolphins are unfriendly to humans.