题目内容
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Have you ever wondered why birds sing? Maybe you thought that they were just happy. After all, you probably sing or whistle (口哨) when you are happy.
Some scientists believe that birds do sing some of the time just because they are happy. However, they sing most of the time for a very different reason. Their singing is actually a warning to other birds to stay out of their territory.
Do you know what a “territory” is? A territory is an area that an animal, usually the male, claims (声称) as its own. Only he and his family are welcome there. No other families of the same species are welcome.Your yard and house are your territory where only your family and friends are welcome. If a stranger should enter your territory and threaten you, you might shout. Probably this would be enough to frighten him away.
If so, you have actually frightened the stranger away without having to fight him. A bird does the same thing. But he expects an outsider almost any time, especially at nesting (筑巢) season. So he is screaming all the time, whether he can see an outsider or not. This screaming is what we call a bird’s song, and it is usually enough to keep an outsider away.
Birds sing loudest in the spring when they are trying to attract a mate and warn others not to enter the territory of theirs.
You can see that birds have a language of their own. Most of it has to do with attracting mates and setting up territories.
72. Some scientists believe that most of the time birds’ singing is actually ______.
A. an expression of happiness
B. a way of warning
C. an expression of anger
D. a way of greeting
73. What is a bird’s “territory”?
A. A place where families of other species are not accepted.
B. A place where a bird may shout at the top of its voice.
C. An area for which birds fight against each other.
D. An area which a bird considers to be its own.
74. One reason for birds’ singing at nesting season is that ______.
A. they want to invite more friends.
B. their singing helps frighten outsiders away.
C. they want to find outsiders around.
D. their singing helps get rid of their fears.
75. How does the writer explain birds’ singing?
A. By comparing birds with human beings.
B. By reporting experiment results.
C. By describing birds’ daily life.
D. By telling a bird’s story.
72---75 BDBA
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相关题目
The early 1900s were very different from today, when toys were still the delight of children everywhere.
Theodore Roosevelt's Presidency marks the beginning of the “Teddy Bear”. In the year 1902，toy bears were named “Teddy” after the president's nickname. The Teddy Bear became known worldwide and it was only a few years later that the Teddy Bears were mass produced.
In 1913，an item called the Erector Set was invented. It was a steel，motorized toy that children could use to build models of anything. Its creator was A．C.Gilbert，a medical doctor.
Charles Pajeau created a similar wooden set called Tinker Toys in the year 1914.Tinker Toys were made for younger children.
Raggedy Ann dolls first came on the scene after newspaper cartoonist Johnny Gruelle reproduced the doll he made for his daughter. That was in 1915.
The following year，an architect's son named John Lloyd Wright，invented Lincoln Logs，which were interlocked to make structures.
Two years after Mickey Mouse was created，stuffed(填塞)Mickey Mouse dolls were made by Charlotte Clark. This was the start of Disney merchandise.
The yoyo became popular in the United States after Donald Duncan bought a yoyo company in 1929.
The ViewMaster，a three dimensional viewer，was developed by a camera enthusiast named William Gruber. The toy became popular when Gruber licensed Disney characters to make still, 3D images from Disney movies and television programs.
Finally，in 1940，model airplanes were mass produced. They started out as a way for manufacturers to sell planes to the military，but later caught on as a toy.
The toys that we know and love today have had their roots from these ancient times. Thanks to all these creative man’s efforts, we know otherwise what we may never know.
【小题1】Why were toy bears named “Teddy”？
| A．To be suitable for mass production |
| B．To be easily pronounced by children. |
| C．To meet the advertisers' needs. |
| D．To memorize President Theodore Roosevelt |
| A．Shape | B．Material used | C．Themes | D．Price |
| A．After William Gruber was born |
| B．After Gruber licensed Disney characters |
| C．Two years after Mickey Mouse was created. |
| D．When Disney merchandise was started |