"Cool" is a word with many meanings. Its traditional meaning is used to (36) a temperature that is fairly cool. As the world has (37) , the word has expanded to (38) many different meanings. "Cool" can be used to express feelings of (39) in almost anything. When you see a brand-name car in the street, maybe you can’t help (40) , "It’s cool." You might think, "He’s so cool," when you see your (41) footballer. We all enlarge the meaning of "cool". You can use it (42) many words such as "new" or "amazing." Here’s an interesting story (43) illustrate the usage of the word: A teacher asked her students to (44) the waterfall they had visited. On one student’s paper was just the one (45) , "It’s so cool." (46) he thought it was (47) to describe (48) he saw and felt. (49) the story also proves the shortage of words and expressions. (50) "cool," some people have no words to express the same meaning. So it is (51) to improve our word strength to maintain some (52) . As a popular word, "cool" stands for a kind of special (53) that people can accept easily. Except "cool", can you think of many words that (54) your life as colorful I can. And I think they are also very (55) .

A. phrase
B. word
C. story
D. sentence