C. pays for every newly-planted tree
D. covered a large area in Africa
B
“Hello” is a relatively new greeting. It first appeared sometime in the mid-1800s, but many people would not have dreamed of using it. “Hello” was considered a very impolite way to greet someone. Instead, people used formal expressions like “How do you do?”
Back then, there were several words that sounded like “hello,” but they were used to get someone’s attention or to express surprise. For example, if you caught your little brother stealing your snack, you might have said, “Halloa there! Stop eating my cheese!” If you found a fly in your soup, you might have shouted, “Hullo! How did that get in there?”
Everything started to change in 1876, when Alexander Graham Bell invented the telephone. The first telephones didn’t have numbers you could dial, nor did they have bells or ringers. Instead, your telephone sent signals along telephone lines to a central office where an operator would answer by saying something like “Are you there, sir?” or “What is wanted?” The operator would then connect your phone to the phone of the person you wanted to reach. There was just one small problem: Since telephones didn’t ring, how would the person you were calling know that you were “on the line”? The answer is you would yell into your phone and hope someone on the other end heard you. But what would you yell? And what would the person you were calling say when they were going to answer? Bell suggested “Ahoy! Ahoy!” but it didn’t catch on. Then the famous inventor Thomas Edison suggested the word hello. That caught on right away.
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