tailieunhanh - Đề thi mẫu tốt nghiệp THPT quốc gia năm 2015 có đáp án môn: Tiếng Anh - Trường THPT Tam Nông

Đề thi mẫu tốt nghiệp THPT quốc gia năm 2015 có đáp án môn: Tiếng Anh - Trường THPT Tam Nông | 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