Question

Have you ever heard someone use the phrase “once in a blue moon”？ People use this expression to describe something that they do not do very often. For example, someone might say that he tries to avoid eating sweets because they are unhealthy, but will eat chocolate “once in a blue moon”. Or someone who does not usually like to go to the beach might say “I visit the shore once in a moon.” While many people use this phrase, not everyone knows the meaning behind it.

The first thing to know is that the moon itself is never really blue. This is just an expression. In fact, the phrase “blue moon” has to do with the shape of the moon, not the color.

As the moon travels around the earth, it appears to change shape. We associate names with certain shapes of the moon. For example, when we can see a small part of the moon, it is called a crescent moon. A crescent is a shape that looks like the tip of a fingernail. When we cannot see the moon at all, it is called a new moon. When we can see the whole moon, it is called a full moon. Usually, there is only one full moon every month. Sometimes, however, there will be two full moons in one month. When this happens, the second full moon is called a “blue moon”．

Over the next 20 years, there will only be 15 blue moons. As you can see, a blue moon is a very rare event. This_fact has led people to use the expression “once in a blue moon” to other very rare events in their lives.

1. Which of the following would be a good example of using the phrase “once in a blue moon”？

A. Simon often tells jokes. Simon tells jokes once in a blue moon.

B. Tom rarely remembers to do exercise. Tom does exercise once in a blue moon.

C. Mary likes to go shopping every weekend. Mary goes shopping once in a blue moon.

D. Cindy hates to stay up, but she stays up every day. Cindy stays up once in a blue moon.

2.When does a blue moon happen in nature?

A. When the moon has a blue moon.

B. When we cannot see the moon at all.

C. When there are two full moons in one month.

D. When we can only see a small part of the moon.

3. Which of the following is another example of something that has a crescent shape?

A. The letter “O”.   B. The letter “M”．

C. The letter “H”.  D. The letter “C”．

4.How often will a blue moon happen over the next twenty years?

A. Once a year.              B. Less than once a year.

C. More than once a year.    D. At least twice a year.

5. What does the underlined part “This fact” in the last paragraph refer to(所指)?

A. A blue moon is a very rare event.

B. The moon appears to change shape.

C. The moon itself is never really blue.

D. A blue moon has to do with the shape of the moon.

Answer

1.B

2.C

3.D

4.B

5.A

【解析】

试题分析：这篇短文主要讲述了人们经常用once in a blue moon来表示“千载难逢”，文章同时详细说明了人们为什么用它来表示“千载难逢”的原因。

1.内容描述，once in a blue moon是“千载难逢”“难得一遇”的意思。结合四个选项的意思，只有B符合题意，表示的是汤姆极少做作业。故选B。

2.短文however there will be two full moons in one month. When this happens, the second full moon is called a blue moon的描述可知应选C。

3.细节理解题。根据短文when we can see a small part of the moon, it is called a crescent moon. A crescent is a shape that looks like the tip of a fingernail. When we cannot see the moon at all, it is called a new moon. When we can see the whole moon, it is called a full moon.的描述可知，字母Ｃ是a crescent shape“月牙形的”。故选D。

4.Over the next 20 years, there will only be 15 blue moons的描述可知，二十多年仅有十五次，一年多一次。故选B。

5.词义猜测题。根据短文第四段a blue moon is a very rare event的描述可知应选A。

考点：日常生活类短文阅读。