题目内容：

Why Radio Stations Always Start With a "K" or "W"

It seems that whenever you switch on the radio in the morning all you hear is "Time to wake up with K98.3," or "WBLS will be right back after this commercial break".1.The majority of radio stations start with the letter "K" or "W".

All radio stations have a four-letter identification code(代码). The hosts of the show typically come up with a more catchy(易记的)station name than just the four letters, but you still hear it sprinkled in with their morning announcements and other advertisements.2.In 1912, several countries attended a conference to discuss international radiotelegraphs. One of the things that came out of that meeting was the assignment(分配)or specific letters to identify each country's radio and television signals.3.

The letters "N" and "A" were given to military stations, but "K" and "W" were assigned out for commercial use.4.And stations west of the Mississippi started with "K".

5.Sometimes they represent the networks that own the radio station for example, WABC, KCBS, and WTBS. Sometimes it's the actual station number, like in KTWO or KFOR. And other times it's an acronym(缩写)such as WTTW for "Windows to the World." But the station that takes home the prize for the best four-letter combination is a sports radio station out of St. Louis that chose the name KRAP.

A. The United States was given the letters W, K, N, and A.

B. The three letters after the "K" Or "W" can mean a few different things.

C. If you listen closely you'll notice that they all have something in common.

D. Radio stations east of the Mississippi River had to start their stations with "W".

E. The two letters you consistently hear date back to when people used to send telegrams.

F. There is some inconsistency since radio stations weren't required to change their name.

G. Try decoding these common acronyms that you probably never knew and figure out what they stand for.