Dolphins are not fish. They are mammals (哺乳動物).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(大腦)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.
小題1:The word "jaw" means_________in Chinese.
A．下顎B．嘴巴C．嘴唇D．鼻子
小題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.
小題3:Who was Jack?
A．The writer.B．A dolphin.C．A seaman.D．The passenger.
小題4:The dolphin guided the ships for about________.
A．32 yearsB．9 yearsC．41 yearsD．23 years
小題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.

小題1:A
小題2:D
小題3:B
小題4:C
小題5:B

小題1:詞義理解推斷題，根據(jù)文中語句“They do not use their ears to receive sounds, but use the jaw--the lower part of the mouth.”理解可知。
小題2:細(xì)節(jié)理解題，根據(jù)文中語句“Like some animals, dolphins use sounds to help them find their way around.”理解可知。
小題3:細(xì)節(jié)理解題，根據(jù)文中語句“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。
小題4:細(xì)節(jié)理解題，根據(jù)文中語句“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。
小題5:細(xì)節(jié)理解題，根據(jù)文中語句“.They live in groups and speak to each other in their own language.”理解可知。
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Look at the first picture. This empty box must fall over, because its center of gravity (C) is not above the line of its bottom (AB).
Now look at the second picture. There is some heavy iron in the bottom of this box. It will not fall, because its center of gravity is above its bottom.

小題1:If the bottom of an object is ______ its top, it will fall over easily.
A．lighter thanB．heavier thanC．no heavier than　　D．a(chǎn)s heavy as
小題2:Please point out which box will not fall.

小題3:The main idea of the passage is _________.
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