Light travels at a speed which is about a million times faster than the speed of sound. In a second, light travels about 300,000km, but sound travels only 340m. You can get some ideas of this difference by watching the start of a race. 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 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 left the moon 1.3 seconds before they reach 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 20 million km, per minute. In some cases, 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 can not say,“the stars are shining tonight.”We have to say,“The stars look pretty. They were shining four years ago but their light has only just reached the earth.”

　　阅读短文，选择最佳答案．

(1) The speed of light is ________ than the speed of sound.

[　　]

A．a million times slower

B．about millions of times faster

C．about a million times faster

(2) 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．sound doesn't travel as fast as light

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

(3) Sunlight ________ to the earth than the light of the moon.

[　　]

A．has to travel a greater distance

B．moves less quickly

C．is less powerful

(4) The scientific way of saying“the star 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 stars were shining long ago but are seen tonight

(5) The light of the nearest star you see tonight has been ________ for four years.

[　　]

A．away from the star

B．on the moon

C．away from the sun

阅读理解

　　Light travels at a speed (速度) which is about a million times faster than that of sound. In one second, light travels about 300,000 kilometers, but sound travels only 340 meters. You can get some idea of this difference by watching the start of a running match. If you stand quite far away from the starter (发令员), you can see smoke come from his gun before the sound reaches your ears.

　　The fast speed of light produces 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 (射线) left the moon 1. 3 seconds before they reached you. The nearest star is so far away that light which you can see from it tonight started to travel to you 4 years ago at a speed of nearly 2 million kilometers every minute. The light from some of tonight's started on its journey towards you even before you were born.

　　So, if we want to be honest (诚实的), we can not say, “The stars are shining brightly tonight.” We have to say. “The stars look nice. They were shining four years ago but their light has just reached our earth.”

1．The best title of this passage is ________.

[　　]

A．Light Travels Faster Than Sound

B．Stars Are Far Away From Us

C．The Speed of Light

D．How Light Rays Travel

2．If you stand 200 meters away from a man who is lifting a gun to 

start a running match, you will find out ________.

[　　]

A．light travels a million times faster than sound

B．the smoke of the gun gets into your sight after the sound of the gun-shot

C．sound travels less fast than light

D．the sound of the gun reached you at the same time with the light of the smoke

3．Sunlight obviously (明显的) ________ than the light of the moon.

[　　]

A．has to travel a greater distance (距离)

B．moves less quickly

C．travels much more quickly

D．is less powerful

4．The scientific way of saying ``The stars are shining brightly 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 stars which were shining long ago but are seen tonight

D．the starlight seen tonight could be seen four years ago

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

[　　]

完形填空

通读下面短文，掌握其大意，然后在所给的四个选项中，选出一个最佳答案。

　　　Light travels very fast. It moves 　1　 300,000 kilometres a 　2　　 　. Light 　3　　 　us from the moon in less than a second and a half. The moon is about 382,000 kilometres 　4　　 　.

　　　Light from the sun reaches us 8.5 minutes. The sun is about 149,640,000 kilometres from the earth.

　　　The other stars are farther away than the sun. Light from the nearest 　5　　 　reaches us in about four years. When you look at a star, you do not 　6　　 　its present condition(目前现状). You see it as it 　7　　 　to be. Light from some stars 　8　　 　hundreds of years to reach us. We never see a star as it is 　9　　 　. We see it as it was long ago, perhaps (也许) hundreds or thousands of years ago.

　　　Astronomers(天文学家)watch stars 　10　　 　big telescopes (望远镜). With these telescopes astronomers can see stars and other things very far away.

　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　

(1) A．on	B．at	C．with	D．by	[　　]
(2) A．minute	B．hour	C．second	D．day	[　　]
(3) A．reaches	B．gets	C．arrives	D．comes	[　　]
(4) A．high	B．far	C．long	D．away	[　　]
(5) A．star	B．moon	C．sun	D．earth	[　　]
(6) A．look at	B．see	C．touch	D．reach	[　　]
(7) A．use	B．used	C．is used	D．using	[　　]
(8) A．takes	B．take	C．spends	D．spend	[　　]
(9) A．before	B．after	C．now	D．future	[　　]
(10) A．in	B．through	C．into	D．onto	[　　]