TAILIEUCHUNG - BÀI TẬP BỔ TRỢ VÀ NÂNG CAO - UNIT 8

Tham khảo tài liệu 'bài tập bổ trợ và nâng cao - unit 8', tài liệu phổ thông, ôn thi đh-cđ phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | BÀI TẬP BỔ TRỢ VÀ NÂNG CAO - UNIT 8 I. Fill in the blank with one suitable word Samuel Morse the 1 . of the telegraph was born in 1791 at Charlestown in the United States of America. When he was a young man he liked painting. He studied art in London. When he returned to America he opened a 2 . in Boston and worked as a portrait painter. In 1829 Morse sailed 3 . Europe to study classic art in Italy. He was an artist and knew little about science. But at the age forty-one far out in the Atlantic Ocean his life 4 . the ship sailing from France to New York carried many passengers among 5 . was Dr. Jackson. He told Morse that electricity could pass through any length of wire. Morse firmly believed that if electricity could be found in any part of a long wire it could be used messages. Soon he began to work out a way to send messages. He wanted to make an instrument that could send messages instantly to any 6 . of the world. Morse thought if my message can go ten miles without stopping I can make it go 7 . the world . He made hundreds of experiments but he had had little knowledge on electricity and couldn t 8 . progress. Morse had idea of making a relay and using a number of such relays for sending weak signals for a long 9 . So the first real telegraph was born. On May 24th 1844 the first message ever sent over wires 10 . from Washington to Baltimore. Morse was not only the first to produce a practical telegraph but he was a pioneer of the 11 . widely used electrical communication in the world today. Morse worked out his famous alphabet or code of dots and dashes. The sender taps out the words in Morse code. Telegraph lines began to go up all over the world. Morse and his assistants did a good deal of work on the submarine cable 12 . that message could be telegraphed across the ocean. II. Use the correct form of verbs A. Laser light can be used for transmit power. Electrical power transfer to laser light. At the end of the distant beam the reverse process takes place.

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