Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42 Since the dawn of time, people have found ways to communicate with one another. Smoke signals and tribal drums were some of the earliest forms of communication. Letters, carried by birds or by humans on foot or on horseback, made it possible for people to communicate larger amounts of information between two places. The telegram and telephone set...
Đọc tiếp
Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42
Since the dawn of time, people have found ways to communicate with one another. Smoke signals and tribal drums were some of the earliest forms of communication. Letters, carried by birds or by humans on foot or on horseback, made it possible for people to communicate larger amounts of information between two places. The telegram and telephone set the stage for more modern means of communication. With the invention of the cellular phone, communication itself has become mobile.
For you, a cell phone is probably just a device that you and your friends use to keep in touch with family and friends, take pictures, play games, or send text message. The definition of a cell phone is more specific: it is a hand- held wireless communication device that sends and receives signals by way of small special areas called cells.
Walkie - talkies, telephones and cell phones are duplex communication devices: They make it possible for two people to talk to each other. Cell phones and walkie- talkies are different from regular phones because they can be used in many different locations. A walkie- talkie is sometimes called a half- duplex communication device because only one person can talk at a time. A cell phone is a full- duplex device because it uses both frequencies at the same time. A walkie-talkie has only one channel. A cell phone has more than a thousand channels. A walkie- talkie can transmit and receive signals across a distance of about a mile. A cell phone can transmit and receive signals over hundreds of miles. In 1973, an electronic company called Motorola hired Martin Cooper to work on wireless communication. Motorola and Bell Laboratories (now AT& T) were in a race to invent the first portable communication device. Martin Cooper won the race and became the inventor of the cell phone. On April 3, 1973, Cooper made the first cell phone call to his opponent at AT& T while walking down the streets of New York city. People on the sidewalks gazed at cooper in amazement. Cooper's phone was called A Motorola Dyna- Tac. It weighed a whopping 2.5 pounds (as compared to today's cell phones that weigh as little as 3 or 4 ounces)
After the invention of his cell phone, Cooper began thinking of ways to make the cell phone available to the general public. After a decade, Motorola introduced the first cell phone for commercial use. The early cell phone and its service were both expensive. The cell phone itself cost about $ 3, 500. In 1977, AT & T constructed a cell phone system and tried it out in Chicago with over 2, 000 customers. In 1981, a second cellular phone system was started in the Washington,D.C and Baltimore area. It took nearly 37 years for cell phones to become available for general public use. Today, there are more than sixty million cell phone customers with cell phones producing over thirty billion dollars per years
What is the main idea of the passage?
A. The increasing number of people using cell phone.
B. The difference between cell phones and telephones.
C. The history of a cell phone
D. How Cooper competed with AT& T
1. I bought a cell phone. I can use it to send and receive e-mail.
=> I bought a cell phone which/that I can use to send and receive e-mail.
2. My new cell phone has become a necessary part of life. I only bought it a month ago.
=> My new cell phone, which/that I only bought it a month ago, has become a necessary part of life.
3. My roommate has never been on the Internet. She is afraid of computers.
=> My roommate, who is afraid of computers, has never been on the Internet.
4. Now, there are psychologists.They help technophobes use technology.
=> Now, there are psychologists who/that help technophobes use technology.
5. A lot of people suffer from technostress. Those people work in my office.
=> A lot of people who work in my office suffer from technostress.
Sử dụng liên từ nối các câu sau :
1. I bought a cell phone. I can use it to send and receive e-mail.
=>I bought a cell phone which I can use it to send and receive e-mail
2. My new cell phone has become a necessary part of life. I only bought it a month ago.
=>My new cell phone has become a necessary part of life what I only bought it on a month ago
3. My roommate has never been on the Internet. She is afraid of computers.
=>My roomate has never been on the Internet who is afraid of computers.
4. Now, there are psychologists. They help technophobes use technology.
=>Now, there are psychologists which help technophobes use technology
5. A lot of people suffer from technostress. Those people work in my office.
=> A lot of people suffer from technostress who work in my office