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 blue 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 certain 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 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 (稀有的)event. This fact has led people to use the expression” once in a blue moon” to describe other very rare events in their lives.
小題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.

小題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 color.

小題3: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.

小題4:What does the underlined part “This fact” in the last paragraph refer to?

A．A blue moon is a very rare event.

B．The moon appears to change shape.

C．The moon itself is never really bluee.

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

Answer 1

小題1:B
小題2:C
小題3:B
小題4:A

試題分析：本文主要講述了人們經常用once in a blue moon來表示“千載難逢”，文章說明了人們為什么用它來表示“千載難逢”的原因。
小題1:根據文意，once in a blue moon是“千載難逢”“難得一遇”的意思。根據四個句子的意思，只有B符合題意。
小題2:根據however there will be two full moons in one month. When this happens, the second full moon is called a blue moon”.可知，本題應該選C。
小題3:根據Over the next 20 years, there will only be 15 blue moons可知，二十多年僅有十五次，一年多一次。所以本題選C。
小題4:根據 a blue moon is a very rare (稀有的)event可知，本題應該選A。
點評：本文的意思是比較簡單易懂的，閱讀時注意對個別詞的理解，如rare、over、 crescent、full等。本題的幾個題目都不能完全在文章中找到原句，需要我們根據對相應的句型和文意的理解來加以推斷，故做題時，注意從總體上把握。