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Haveyoueverheardsomeoneusethephrase"onceinabluemoon"?Peopleusethisexpressiontodescribesomethingthattheydonotdoveryoften.Forexample,someonemightsaythathetriestoavoideatingsweetsbecausetheyareunheal
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问题描述:

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

31.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.

32.When does a blue m

胡劲松回答:
  31.B 推测理解题:根据People use this expression to describe something that they do not do very often人们用这种表达来描述他们不经常做的事情,onceinabluemoon是"千载难逢""难得一遇"的意思,结合选项B汤姆很少记得做运动,汤姆做了一次千载难逢的锻炼,符合题意,故选B.   32.C 细节理解题:根据howevertherewillbetwofullmoonsinonemonth.Whenthishappens,thesecondfullmooniscalledabluemoon但是在一个月内会有两个满月,当这发生时,第二个满月叫做蓝色月亮,故选C.   33.D 细节理解题:根据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当我们看到月球的一小部分时,它被称为新月形.一轮新月的形状,看起来像一个指甲尖时,我们根本不可能看到月亮,联系实际故新月的形状像字母C.故选D.   34.B 细节理解题:根据Overthenext20years,therewillonlybe15bluemoons可知,二十多年仅有十五次,一年多才一次.所以本题选B.   35.A 词义理解题:根据前文As you can see,a blue moon is a very rare(稀有的)event正如你所看到的,蓝色月亮是非常罕见的事件,后文这个事实指的就是前文的事实,本题应该选A.
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《Haveyoueverheardsomeoneusethephrase"onceinabluemoon"?Peopleusethisexpressiontodescribesomethingthattheydonotdoveryoften.Forexample,someonemightsaythathetriestoavoideatingsweetsbecausetheyareunheal|小学英语问答-字典翻译问答网》
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