题目内容
When was the last time you relied on an old-fashioned map to figure out the route to an unfamiliar place? For many, the GPS has revolutionized navigation, making a paper map almost obsolete? So how has this piece of technology developed over its 26 years of existence? On February 14,1989,the first satellite in the US Global Positioning System was sent into space from Cape Canaveral, beginning the start of one of the wonders of the modern world.
GPS stands for Global Positioning System, which is made of a network of around 30 satellites that move around the earth. The system uses a process called trilateration to find out one’s position. By measuring the time it takes for the signal to reach one satellite, the GPS can determine your distance from the satellite, creating a sphere(范围) of possible locations. Measuring your distance from at least three satellites will narrow your location to the place where the three spheres cross one another, to the accuracy(精确) of about less than 1 meter!
The GPS was first invented during the Cold War by the United States Department of Defense. In 1960, the first system, which was made of just five satellites, was put into place. It was initially created for strictly military(军事的) use; however, in 1983, as a result of faulty navigation technology, a Korean passenger plane mistakenly flew into USSR territory(苏联领土) and was shot down. In order to prevent such bad events, American President Ronald Reagan allowed civilian(民用的) use of the GPS.
Over the next ten years, the system’s accuracy improved as the network was increased to 24 satellites. And during the first Persian Gulf War, the new GPS was finally used by the military. Now scientists use the technology to track animals to better understand their movement and behavior. Parents who may be worried about their children can also use GPS technology to track them.
1.The underlined word “obsolete” in Paragraph 1 can best be replaced by “ ”.
A. priceless B. unusual
C. perfect D. useless
2.The second paragraph is mainly about .
A. how the GPS works B. the history of the GPS
C. the applications of the GPS D. some problems with the GPS
3.According to the text, the GPS .
A. has a history of over 100 years
B. became popular during the Cold War
C. relies on the satellites circling the earth
D. was available first during space exploration
4.What does the author think of the GPS?
A. It is not always reliable
B. It has a lot of uses in many fields
C. It makes our life more peaceful
D. It will soon go out of fashion
高效智能课时作业系列答案Music is a Universal Language
“Music is the universal language of mankind.” – Henry Longfellow
Everyone has the inborn ability to understand and enjoy music. There are many theories as to why this is, but it has become a part of human beings. Since the beginning, humans have expressed themselves through music. Simple tribal rhythms evolved into many types of more complex music, including classical, rock, jazz, and R&B. While the styles between these many types of music may vary, everyone is able to understand and relate to them.
What are the essential parts of a language? Every language uses vocabulary, or a set of words, to create sentences that convey messages. The tone and style of the sentences convey different feelings or emotions. Music is exactly the same way. Twelve tones, or notes, are combined to create phrases that also convey emotion. Music can even be written, like most other languages. Conversations even take place in music. Two saxophonists can play melodies back and forth, expressing different styles and feelings, building off of each other, responding to each other. Music changes over the years like other languages. Most people who speak fluent English cannot read one of Shakespeare’s plays because the language has changed so much. Music is also affected by time, and over a long period, many new types of music and instruments have emerged to create different sounds and convey different messages. There are so many similarities between vocal language and music that they must be same.
I recently had a chance to experience conversation through music. In 2008, I traveled to Manila, Philippines to participate in a high school jazz exchange where many students from all over Asia came together to share their talents. Everyone was mixed into different small groups to prepare for a concert at the end of week. Few people spoke fluent English so vocal communication was very tough. However, it wasn’t needed. Everyone seemed to understand each other simply through the music and there were few times where direct translation was needed. At the performance, every group played for a live audience. They all sounded phenomenal and it felt like they were in perfect time and harmony. During my group’s performance, I was able to improvise with a Korean boy who spoke very little English. But we managed to have a conversation through our instruments, building off each other’s riffs until we were creating our own melody on the fly. It was a great experience.
Because of the many similarities that music shares with other languages, it is a very effective way to communicate with others. Music brings us together, connects us with other people, and allows us to express ourselves in ways that are different from speech and writing. It has the ability to convey emotions and messages to the core of people, which is why Henry Longfellow is absolutely correct when he states that “music is the universal language of mankind.”
Music is a Universal Language
Introduction | ● Human beings have the ability to appreciate music since they were 1.. ● Despite the different types2. from simple tribal rhythms, everyone is able to understand music. |
3. between language and music | ● The tone and style of the sentences convey different feelings or emotions, 4. does music. ● Like most other languages, music even has its 5. forms. ● Both language and music have gone 6. many changes over the years. ● Conversations even take place in music. ● Time also has a great 7. on music. New forms of music and instruments come up to convey different messages. |
My chance of 8. conversation through music | I participated in a high school jazz exchange in Philippines in 2008, where students came from all over Asia. While there were language 9. between us, we still managed to communicate well by music. |
Conclusion | Music is a very effective way to communicate with others. Just as Henry Longfellow 10. it, “music is the universal language of mankind.” |