阅读下列短文, 从每题所给的四个选项(A、B、C和D)中选出最佳选项。 Morse code (密码) is a system of communication that uses dots (●), dashes(), and spaces to represent(代表) the letters and numbers. In Morse code, the letters used often (such as"E") got a simple code, while those letters not often used (such as"Q") got a longer and more eomplex code. For example, letter A is one dot and one dash, letter E is one dot, and letter I is two dots. While letter Q is two dashes, one dot and one dash, and letter Z is two dashes and two dots.
The first message using Morse code was sent by Samuel Morse, one of its inventors, to Alfred Vail on May 24th,
1844. The two men were nearly 65 kilometers away from each other at that time. From then on, the way to communicate with people in far places was changed.
Morse code is a helpful way to communicate, even in difficult and noisy environments. It can be sent by sounds, light, or in other unexpected ways. Jeremiah Denton Jr. was a prisoner(犯人) of war between 1965 and 1973 As a high ranking officer, he was forced to take part in a TV interview on May 2nd,
1966. During the broadcast(直播), Denton Jr. pretended (假装) to be blinded by the camera lights in order to blink(眨眼) a Morse code message to those people watching at home.
Later, Morse code was replaced first by the telephone, then the fax machine, and finally by the Internet. But isn' t it fun to send a message in Morse code to your friends? Give it a try!