Maybe you are familiar with scenes in movies where a pilot has encountered" an issue mid-flight and you hear him shout " Mayday,mayday,mayday".
But what does "mayday" mean? "Mayday" is an internationally recognized distress call,mostly used by pilots and boat captains.The signal can be sent out by any channel by radio communication.
This emergency call originated in the 1920s.At that time,the standard distress call was "SOS" and was typically used by navy captains.The message was sent in Morse code by telegraph.In Morse codes,"SOS" is three dots" ,three dashes' and three dots.The signal was unmistakable.However,aircraft pilots use radio calls,so sending out "SOS" could be misheard as other letters,such as "F".
Frederick Stanley Mockford,a radio officer at Croydon Airport in London,was asked to think of a word that would indicate distress.Because of the amount of the flights that flew between Croydon and Paris,he chose mayday,as it sounds similar to the French word "m'aider",which means "help me".
Facing a threatening situation,pilots are required to repeat the signal three times in case of radio interference or loud background noise.If the pilots don't get a reply within two minutes,they should repeat it.Once they receive a reply,more information,including the code of the flight,their current situation and the number of people on board should be reported.Sometimes pilots are directed to a nearby airport or location where they can make an emergency landing.While mayday signals indicate a life-threatening situation,they do not always end in fatalities.
Despite dangers,air travel is still the safest means of transport.
(1)What does the article tell us about "mayday"? AA
A.It was sent by telegraph in the beginning.
B.It is only used by pilots and boat captains.
C.It was invented by a radio reporter in the 1920s.
D.It is a signal mainly used in European countries.
(2)How is "SOS" written in Morse code? DD
A.---???--
B.------???
C.??????---
D.???---???
(3)"Mayday" was chosen as a distress call because BB.
A. "SOS" was easily misheard by navy captains
B.it sounds similar to "m'aider",the French word for "help me"
C.its pronunciation is similar to "distress" in French
D.it had something to do with the flight at Croydon Airport
(4)What does the fifth paragraph mainly talk about? DD
A.When to use mayday signals.
B.What makes mayday signals useful.
C.How mayday signals were recognized.
D.How to use mayday signals to call for help.
【答案】A;D;B;D
【解答】
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發(fā)布:2024/4/20 14:35:0組卷:3引用:1難度:0.5
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