If you look at the sky one night and see something moving and shining that you have never seen before, it might be a comet (彗星).
A comet sometimes looks like a star. Like a planet, a comet has no light of its own. It shines from the sunlight it reflects (反射). Like the earth, a comet goes round the sun, but on a much longer path (轨道) than the earth travels.
If a comet isn’t a star, what is it then?
Some scientists think that a large part of a comet is water frozen into pieces of ice and mixed with iron and rock dust and perhaps a few big pieces of rock. When sunshine melts (融化) the ice in the comet, great clouds of gas go trailing after it. These clouds, together with the dust, form a long tail.Many people perhaps have seen a comet. However no one knows how many comets there are. There may be millions of comets, but only a few come close enough for us to see.
An Englishman named Edmund Halley, who lived from 1656 to 1742, found out a lot about the paths that comets take through the sky. Some comets move out of our sight and never come back. Others keep coming back at regular times. A big comet that keeps coming back was named after Halley because he was the one who worked out when it would come back again. Maybe you have ever seen Halley’s Comets because the last time it came close to the sun and the earth was in the year 1986. Then people all over the world were outside at night to look at it. You will probably be able to see Halley’s Comets when it comes near the earth again.
1.A comet is like ________.
A. sun B. moon C. sunlight D. the earth
2.A large part of a comet is ______.
A. water and rock
B. water frozen into pieces of ice and mixed with iron
C. ice, iron and rock dust
D. only a few big pieces of rock
3.Maybe many people _______.
A. haven’t seen any comets B. have seen all comets
C. have seen a comet at daytime D. have seen a comet
4.Some comets keep coming back ________.
A. at any time B. at noon C. at regular times D. at daytime
5.Halley’s Comets came back _____.
A. in 1990 B. in 1980 C. in 1986 D. in 1989
One day, a boy found the cocoon(茧) of a butterfly and brought it home. A few days later, the boy saw a small in the cocoon. He sat and watched for several hours as a butterfly struggled to make body through that little hole. Suddenly it stopped. So the boy to help the butterfly, thinking the butterfly might be .He took a pair of scissors and cut the hole .The butterfly came out of the cocoon but it a little different. It had a weak body and small, thin . The butterfly didn’t start to fly. In fact, the butterfly spent the rest of its life crawling(爬行) around with a weak body and thin wings. It was never able to fly.
The boy acted with but he didn’t understand why it could be like this. When a butterfly crawls out of the cocoon, it must struggle. The hard work of out of the cocoon makes the fluid(液体) from the butterfly’s body into its wings. It helps the butterfly be to fly. If the butterfly never has to squeeze(挤压) itself out of the cocoon, its wings will never get the fluid and it can never fly.
struggles are what we need in our lives. If we lived our lives without any problems, we would never learn or grow. We would not be we could have been and we would never fly.
In our lives, pain and suffering is the key to all windows, and sometimes even growth, without it , there's no way of life. We can't avoid or problems. So, next time you are a problem or difficulty, remember the butterfly. Struggle a little—then fly!
1.A. hole B. worm C. tall D. snake
2.A. it B. it's C. itself D. its
3.A. decided B. asked C. showed D. ordered
4.A. afraid B. interested C. surprised D. grateful
5.A. slimmer B. bigger C. shorter D. smaller
6.A. touched B. sounded C. looked D. smelt
7.A. wings B. feet C. eyes D. head
8.A. success B. excitement C. kindness D. humour
9.A. get B. getting C. to get D. got
10.A. ready B. quiet C. glad D. used
11.A. Somewhere B. Something C. Some time D. Sometimes
12.A. as helpful as B. as weak as C. as strong as D. as creative as
13.A. repeats B. recommends C. requires D. represents
14.A. happiness B. difficulties C. pleasure D. hope
15.A. served with B. growing into C. bringing in D. faced with
—I will have an English test tomorrow.
---_________ .
A. Good luck B. congratulations
C. Have a good time D. It’s up to you
If I ____ you, I ____ buy a bike for him.
A. was, would B. was, could C. were, would D. were, could
The art club is for members only. You can’t go in ____ you are a member.
A. unless B. because C. if D. though
I have a lot of rules at home, _________
A. So has Peter. B. So Peter has.
C. So does Peter. D. So Peter does.
