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Câu hỏi: Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer for each of the questions from 35 to 42.
In the 1870s, two inventors-Elisha Gray and Alexander GrahamBell - independently developed devices for transmitting speech electrically, an invention which would become known as the telephone. Both men rushed their respective designs to the patent office within hours of each other; however, Bell patented his phone first. The telegraph and telephone are both wire-based electric systems, and Bell's success with the telephone was a direct result of his attempts to improve the telegraph.
When Bell began experimenting with electrical impulses, the telegraph had been an established means of communication for more than 30 years. It was a highly successful system, but ữsdot-and-dash Morse code was limited in terms of sending and receiving. Bell's extensive understanding of sound and knowledge of music contributed to his concept of transmitting multiple messages over one wire simultaneously. His "harmonic telegraph" was based on the principle that several note could be sent simultaneously along the same wire if the notes or signals differed in pitch.
Bell's harmonic telegraph was based on the idea that
A. Several notes could be sent along the same wire at once.
B. Dots and dashes were the best means of communication
C. People needed a way to send messages faster.
D. People wanted something new.
In the 1870s, two inventors-Elisha Gray and Alexander GrahamBell - independently developed devices for transmitting speech electrically, an invention which would become known as the telephone. Both men rushed their respective designs to the patent office within hours of each other; however, Bell patented his phone first. The telegraph and telephone are both wire-based electric systems, and Bell's success with the telephone was a direct result of his attempts to improve the telegraph.
When Bell began experimenting with electrical impulses, the telegraph had been an established means of communication for more than 30 years. It was a highly successful system, but ữsdot-and-dash Morse code was limited in terms of sending and receiving. Bell's extensive understanding of sound and knowledge of music contributed to his concept of transmitting multiple messages over one wire simultaneously. His "harmonic telegraph" was based on the principle that several note could be sent simultaneously along the same wire if the notes or signals differed in pitch.
Bell's harmonic telegraph was based on the idea that
A. Several notes could be sent along the same wire at once.
B. Dots and dashes were the best means of communication
C. People needed a way to send messages faster.
D. People wanted something new.
Câu trả lời này dựa vào thông tin "His "harmonic telegraph"... the principle that several note ... simultaneously along the same wire if the notes or signals differed in pitch."
Đáp án A.