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　　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 (發令員), 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 (射線) 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 (誠實的), 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 (明顯的) ________ than the light of the moon.

[　　]

A．has to travel a greater distance (距離)

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.

[　　]

We all know the Moon goes around ________.

[　　]

A．the Sun

B．the Earth

C．the Star

D．the space

There are many people in the world now. There will____1____a lot more people next century. ____2____earth will be very crowed____3____there will be a little room____4____each person. Maybe there will be____5____room only on the earth 600 years ____6____. That will be a very serious problem.

So man is ____7____ of a way to solve the____8____

The moon is the ____9____ of the earth. Maybe man will go to ____10____on the moon one day. But there ____11____no air,no plants,no life there. So ____12____ are doing experiment ____13____many ways. They____14____solve many problems ____15____man can live on the moon. I am sure our dream will come true in the next century.

1． (　)A．be　　    B．are　　　　 C．has　　　　  D．have

2． (　)A．/　　　　 B．The　　    C．An　　　　   D．A

3． (　)A．but　　   B．or　　　　 C．and　　　　   D．so

4． (　)A．to　　    B．at　　　　 C．with　　　　  D．for

5． (　)A．standing    B．sitting　　 C．sleeping　　   D．doing

6． (　)A．faster　　　　 B．later    C．earlier　　   D．sooner

7． (　)A．saying　　   B．telling　　 C．thinking　　 D．knowing

8． (　)A．matter　　 B．accident　　 C．question　　  D．problem

9． (　)A．satellite　　 B．sun　　    C．star　　　　   D．sky

10． (　)A．see　　   B．stay　　    C．look　　　　  D．lives

11． (　)A．are　　    B．is　　　　 C．am　　　　   D．was

12． (　)A．farmer　　  B．teachers    C．workers　　    D．scientists

13． (　)A．in　　　　 B．with　　   C．on　　　　 D．of

14． (　)A．may　　   B．have to　　 C．can　　   D
．will

15． (　)A．before　　 B．after　　   C．since　　   D．till