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Math holidays everyone should know
In recent years mathematicians and scientists have begun campaigns to mark certain dates in celebration of significant principles and here are a few to add to your calendar
Mole Day
Mole Day is celebrated yearly on Oct. 23 from 6: 02 a.m to 6: 02 p.m.. The idea of a celebratory day was put forward by a chemistry teacher in 1991 and has been honored every year since. It celebrates Avogadro's Number, which is a basic measuring unit in chemistry. Each Mole Day has a specific theme.
Pi Day
The granddaddy of mathematical and scientific holidays, however, falls every year on Mar. 14. The date, 3/14, represents the first three numerals in the calculation of pi, so the date is known annually as Pi Day.
Pi Day was founded in 1988 by a physicist. The observations spread to the point where on Mar. 12, 2009, the U.S. House of Representatives passed a resolution declaring Mar. 14 as National Pi Day.
Fibonacci Day
Nov. 23 marks Fibonacci Day, a special day that celebrates the man known as Fibonacci who developed a mathematical idea called the Fibonacci Sequence, in which every number is the sum of the previous two numbers. So, for example. 11/23 marks the day because 1+1 equals 2, and then 1+2 equals 3（the date being the 23rd）.
Square Root Day
Square Root Day is a holiday that heartily honors those dates where the combination of day and month and year form square roots: e.g. 2/2/04 and 3/3/09. The last Square Root Day was 4/4/16. The holiday was created by a high school teacher Ron Gordon. Square Root Day has its own website where celebrants can gather before the next holiday.
21．How is Mole Day similar with Pi Day?
A．They both have themes. B．They are yearly holidays.
C．They fall on the same day. D．They are created by a teacher.
22．Which holiday is to honor a person?
A．Mole Day. B．Pi Day. C．Fibonacci Day. D．Square Root Day.
23．Which day might be celebrated as Square Root Day?
A．10/23/22. B．11/23/23. C．3/12/29. D．5/5/25.
【答案】21-23 BCD
【解析】21.细节理解题。根据Mole Day部分中“Mole Day is celebrated yearly on Oct. 23 from 6: 02 a.m. to 6: 02 p.m.”以及Pi Day部分中“The granddaddy of mathematical and scientific holidays, however, falls every year on Mar. 14. The date, 3/14, represents the first three numerals in the calculation of pi, so the date is known annually as Pi Day.”可知，Mole Day和Pi Day的相似之处是它们都是年度节日。故选B。
22.细节理解题。根据Fibonacci Day部分中“Nov. 23 marks Fibonacci Day, a special day that celebrates the man known as Fibonacci who developed a mathematical idea called the Fibonacci Sequence”可知，Fibonacci Day是为了纪念一个人。故选C。
23.推理判断题。根据最后一段中“Square Root Day is a holiday that heartily honors those dates where the combination of day and month and year form square roots: e.g. 2/2/04 and 3/3/09”可推知，5/5/25有可能被作为平方根日庆祝。故选D。
