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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
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When Jenny was old enough, I sent her to a kindergarten(幼儿园). On the first morning, Jenny spent hours playing by herself. It seemed that she felt very(41).
However, to my joy, Jenny’s classmates always (42) her, “You got al your speling words right today!”In fact, her speling list was the (43). Later, she faced a very painful (44) —— at the end of the term, there was a game which had (45) to do with physical education. But Jenny was (46) in it.
My husband and I were anxious about the day. I wanted to let my child stay home! But my heart wouldn’t let me off that easily. So I (47) a pale, unwiling Jenny onto the school bus.
At the kindergarten, I was quite worried because of her (48) action, Jenny would probably hold up her team. The game went wel until it was time for the sack(麻袋)race. Surely Jenny would find it (49). Now each child had to climb into a sack, jump to the finishing line, return and climb out of the sack. I noticed Jenny standing near the end of her line of players.
But as it was her turn to join, a change took place in her (50). The talest boy behind Jenny placed his hands on her waist(腰). Two other boys (51) in front of her. The moment the player before Jenny stepped out from the sack, the two boys (52) the sack suddenly and kept it open while the tal boy lifted Jenny and (53) her into it. A girl nearby took her hand and supported her (54) Jenny got her balance. Then she jumped forward, smiling and proud. In the cheers of the teachers, schoolmates and parents, I silently thanked the warm, understanding people in life who made it (55) for my disabled daughter to be like her felow human beings. Then I finaly cried.
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