Câu hỏi:

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 26 to 35.

Blue Moon

“Blue Moon” is a term that is used to describe the phenomenon of a second full moon occurring in one month. How could two full moons possibly occur in a single month? It is not nature’s fault; the natural phrases of the moon do not perfectly match up with the Roman calendar.

Although still used today, this calendar was devised by Julius Caesar and Augustus Caesar over 2000 years ago. While the calendar works well, the method that they used does not match the lunar cycle exactly. Thus, occasionally the moon will go through its “full” phrase twice before the month changes.

[1] A “blue moon” is an uncommon event. [2] And it rare occurrence of a eventually led to the usage of the phrase “once in a blue moon”. [3] This phrase was commonly used to indicate an event that could never happen. Over time, the meaning of the phrase changed from something that seldom happens. [4] Today, this phrase is used to indicate extremely rare events, the absurd, or things that never happen.

Which of the following can be inferred from the passage?