After being agreed upon at the Radio and Telegraphic Conference, the Morse code signal of three dots, three dashes, and then three dots (sent together, without spacing) went into effect as the international signal for distress 2 years later.The letters were chosen because the Morse code of three dots, three dashes, and three dots was easy to recognize and people were able to make as few mistakes as possible when sending it.

　　Although officially the international signal for distress was “SOS”， many people still used the old signal of “CQD”．Even in 1912, when the Titanic began to sink, its radio operator first sent the “CQD” distress signal.Then another operator suggested also sending the new “SOS” signal.It took several years for “SOS” to replace the old signal.

　　【解题导语】　全文讲述“SOS”作为国际求救信号是什么时间发明的。

　　28．“SOS” went into effect as the international signal for distress in________.

　　A．1904

　　B．1906

　　C．1912

　　D．1908

　　答案　D　[推理判断题。从第3、4段可知，1906年会议确定SOS为求助标志，两年后才生效。]

　　29．Which of the following is the correct Morse code for “SOS”？

　　A．···△△△···

　　B．— — — ○○○ — — —

　　C．···— — —···

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