This is my classroom. It is not very big, but it is very nice. There are two blackboards on the wall, but there aren't any pictures. There is a clock on the front(前面的) wall. The map of the world is on the wall, too. There is a computer in the teacher's desk. You can't see it. There are forty students in my class, eighteen girls and twenty-two boys. There are forty desks and chairs for us. Miss Chen is our English teacher. Her English is very good. We all like her class.
【小题1】There _____ pictures on the wall.
A. are some         B. aren’t any          C. are two
【小题2】The _____ is on the front wall.
A. map              B. clock                C. computer
【小题3】There are _____ girls in the class.
A. 40               B. 22               C. 18
【小题4】_____ English is very good.
A. My               B. Their                C. Miss Chen’s
【小题5】–How many computers are there in the classroom? –_____.
A. One.             B. Two.             C. Sorry, I don’t know.

Light travels at a speed which is about a million times faster than the speed of sound. You can get some idea of this difference by watching the start of a race. If you stand some distance(距离) away from the starter, you can see smoke from his gun before the sound reaches your ears.

This great speed of light produces some strange facts. 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. The nearest star is so far away that the light that 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, the light from one of tonight’s stars had started on its journey to you before you were born.

Thus, if we want to be honest, we can’t say, “The stars are shining tonight.” We have to say instead, “The stars look pretty. They were shining four years ago, but their light has only just reached the earth.”

1.Light speed is ______ sound speed.

A. as fast as                          

B. a million times slower than

C. about millions of times faster than     

D. about a million times faster than

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 sound before you see the smoke

B. the sound does not travel as fast as light

C. the sound will reach you before the man fires

D. sound travels about a million times faster than light

3.Sunlight obviously(显然的) ______ than the light of the moon.

A. has to travel a greater distance          

B. moves less quickly

C. travels much more quickly            

D. is less powerful

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 shine four years later

C. the stars were shining long ago but seen tonight

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