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Light travels(传播)at a speed which is abo...

Light travels(传播)at a speed which is about a million times faster than the speed of sound.In one second,light travels about 300,000 km,but sound travels only 344m.You can get some idea of this difference by watching the start of a race(比赛).If you stand some distance away from the starter,you can see smoke come from his gun before the sound reaches your ears.This great speed of light produces(产生)some strange facts.Sunlight takes about 8 minutes to reach us.If you look at the light of the moon tonight,remember that the light rays(光线)left the moon 1.3 seconds

before they reached you.

The nearest star is so far away that the light which you can see from it tonight started to travel towards you four years ago at a speed of nearly 2 million km per minute.In some cases(在某种情况下)the light from one of tonight's stars started on its journey to you before you were born.

Thus,if we want to be honest,we cannot say "The stars are shinning(发光)tonight."We have to say,"The stars look pretty.They were shining four years ago but their light has only just reached Earth."

1.If you stand 200 meters away from a man who is firing a gun to start a race,you will find out that _____.

A. you can hear the gun before you see the smoke.

B. the sound of the gun will reach you before the man fires his gun.

C. sound does not travel as fast as light.

D. sound travels about a million times faster than light.

2.Sunlight clearly_____than the light of the moon.

A. moves less quickly    B. has to travel a greater distance

C. travels much more quickly    D. is less powerful

3.What does " it" in the second paragraph refer to?

A. moon light    B. light rays

C. the moon    D. the nearest star

4.The scientific way of saying " The stars are shining tonight" should be________.

A. the stars have been shining all the time.

B. the stars seen tonight will be shining four years later.

C. the starlight seen today could be seen four years ago.

D. the stars were shining long ago but are seen tonight.

5.The light of the nearest star you see tonight has been ______ for years.

A. away from the star    B. on the moon

C. away from the sun    D. on the earth

 

1.C 2.B 3.D 4.D 5.A 【解析】这篇短文中作者主要介绍了光的传播速度要远远高于声的传播。文章又向我们描述了一种奇怪的自然现象,引起了人们的思考。 1.细节理解题。根据短文第一段最后一句话If you stand some distance(距离) away from the starter, you can see smoke from his gun before the sound reaches your ears.可知,看到烟雾要比听到声音早,即声音和光传播的并不是一样快的,其他三项表述错误;故选C。 2.推理判断题。根据短文第二段Sunlight(太阳光) takes about 8 minutes to reach us. If you look at the light of the moon tonight, remember that the light rays left the moon 1.3 seconds before they reached you.两句可知,太阳光传播的距离要远远大于月光;故选B。 3.根据The nearest star is so far away that the light which you can see from it tonight started to travel towards you four years ago at a speed of nearly 2 million km per minute.可知 第二自然段中的“it” 指的是最近的星球。 4.推理判断题。根据短文最后一句话“The stars look pretty. They were shining four years ago, but their light has only just reached the earth.”可知我们今晚看到的星光是四年前就已经发射出来了,只是我们现在才看到;与D项描述相吻合;故选D。 5.根据In some cases(在某种情况下)the light from one of tonight's stars started on its journey to you before you were born. 可知你今晚所能看到的离你最近的星星发出的光线是很多年以前的星星发出的光。
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BUS SERVICE

New York City — Brennan, New Jersey

(Trip time: 30 minutes each way )

Timetable

●Buses leave the Railway Station, New York 7:00 a.m. and every half-hour thereafter(此后) until 11:30 p.m. (7 days a week).

●Buses leave Brennan Station 20 minutes before and after every hour from 6:20 a.m. to 10:40 p.m. (7 days a week ).

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【写作内容】

1.以约30个词概括上文的主要内容。

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(3)Ferrero及其家人成功制作巧克力对你的启迪。

【写作要求】

1.作文中可以使用亲身经历或虚构的故事,也可以参照阅读材料的内容,但不得直接引用原文中的句子。

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【评分标准】

内容完整,语言规范,语篇连贯,词数适当。

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Because six out of every 10 accidental deaths happen to Chinese children who are playing, Shanghai Johnson & Johnson Pharmaceutical (SJJP), a US­based pharmaceutical giant, is working on a Safe Kids Program to prevent injuries and deaths.

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Title: Safe Kids Program

1.

The program is intended to 2. accidental injuries and deaths.

Background

It is sponsored by SJJP, which specializes in making and 3. non­prescription medicine and health care foods and products.

It follows the example of the successful experience of Safe Kids. Worldwide in the US, which accounts for a 40% 4. in such injury cases.

5.

More than 50% of the parents don't know how to help keep children safe.

Half of the parents are not 6.of their children's motor skills.

40% or more of the parents fail to help their children prepare well before sports activities, such as warming up and

7. the playground.

Solutions

They have been sending safety education materials to 8.and delivering lectures in schools and communities, all for 9..

A special team has been 10.and is now traveling around to popularize child sports safety knowledge and offering free training for young parents.

 

 

 

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