题文

阅读理解。

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 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 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 will be two full moons in one month. When this happens, the second full moon is called a moon".      Over the next 20 years, there will only be 15 blue moons. As you can see, a blue moon every 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 nates 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 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.

题型：阅读理解  难度：中档

答案

1- 5 BCDBA

据专家权威分析，试题“阅读理解。 Have you ever heard someone use the phrase"once ..”主要考查你对  科教类阅读  等考点的理解。关于这些考点的“档案”如下：

科教类阅读

考点名称：科教类阅读

• 科普类的阅读：
  科普类的阅读理解包含介绍科学知识、社会知识的短文。阅读这类短文时，要以事实为中心进行思考，抓住事物的特征、用途、相互关系等。
  如果是介绍社会现象的文章，要掌握所谈现象的内涵。

• 答题技巧：
  1. 加强整体意识，把握文章的主要内容。在阅读的时候可给段落标上序号，并给重要的句子和
     关键词做上记号，尤其是各段中心句，为答题提供更快捷更多的信息源。
  2. 审清题干，发觉和把握试题中有效的提示性信息，确认命题的角度、阅读范围和答题方式。
  3. 定位阅读，强化对应意识。同时要注意原文利用和自我加工相结合。