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
1.D。“Like the earth, a comet goes round the sun, but…”是判断本题的根据。
2.C。根据“…is water frozen into pieces of ice and mixed with iron and rock dust and perhaps a few big pieces of rock.”这句话即能得出答案。
3.D。由第五段的首句“Many people perhaps have seen a comet.”可知。
4.C。“Some comets move out of our sight and never come back. Others keep coming back at regular times.”一句是答案的出处。
5.C。哈雷彗星每七十六年才能看到一次。再结合“…the last time it came close to the sun and the earth was in the year 1986.”这句话的意思，即可得到答案。
A farmer had a cow. He took very good care of this cow and one day when it was ill, he was very worried. He telephoned the vet.
“What’s the problem?” The vet asked him when he arrived.
“My cow's ill,” the farmer said. “I don’t know what's the matter with her. She’s lying down and won’t eat. She's making a strange noise.”
The vet looked over the cow. "She's certainly ill," he said, "and she needs to take some very strong medicine."
He took a bottle out of his box, put two pills into his hand and said, "Give her these. The pills should make her better."
“How should I give them to her?” the farmer asked.
The vet gave him a tube (管子)and said, "Put this tube in her mouth, then put the pills in the tube and blow. That'll make it."
The next day the vet came to the farm again. The farmer was sitting outside his house and looked more worried.
“How's your cow?” the vet asked.
“No change,” the farmer said, “and I’m feeling very strange myself.”
“Oh?” the vet said, "Why?"
“I did what you said,” the farmer answered. “I put the tube in the cow's mouth and then put two pills down it.”
“And?” the vet asked.
“The cow blew first,” the farmer said.
1.In the story, the vet must be _________.
A. the farmer's friend B. a milk factory
C. a hospital for cows D. a doctor for animals
2.The farmer asked the vet for help when his cow _______
A. couldn't lie down B. didn't eat the pills
C. couldn't make any noise D. was ill
3.What medicine did the vet give the farmer?
A. Bottle of pills. B. A long tube.
C. Two pills. D. A small box.
4.The vet taught the farmer how _________.
A. to blow the tube B. to make the cow take the pills
C. to take the medicine D. to put the tube in his mouth
5.Which of the following is true?
A. The farmer ate the pills himself.
B. The cow got better after taking the medicine.
C. The vet came to help farmer change the cow the next day.
D. The farmer waited for the vet outside his house the next day. Passage 2
2.D。由“She’s lying down and won’t eat. She's making a strange noise.”可以排除A和B。C显然不对。
3.C。“He took a bottle out of his box, put two pills into his hand…”一句是答案的出处。
4.B。 由“How should I give them to her?”这句话可知。
On November 18th, 1908, three men went up in a balloon. They started early in London. The headman was Auguste Gaudron, and the other two men were Tannar and Maitland. They had a big balloon, and they were ready for a long way.
Soon they heard the sea below them. They were carrying the usual rope , and it was hanging down from the basket of the balloon. At the end of the rope they had tied a metal box. This could hold water. Or it could be empty. So they were able to change its weight. They were also carrying some bags of sand.
After the sun rose, the balloon went higher. It went up to 3,000 meters, and the air was very cold. The water in the balloon became ice. Snow fell past the men’s basket, and they could see more snow on the ground. There was also some snow on the balloon, and that made it very heavy. It began to go down towards the ground. The men tried to throw out some more sand; but it was hard. They tried to break the icy sand with their knives, but it was not easy. The work was slow and they were still falling; so they had to drop some whole bags of sand. One of them fell on an icy lake below and made a black hole in the ice.
At last they pulled the box into the basket. It was still snowing; so they climbed to get away from the snow. They rose to 5,100 meters! Everything became icy. They were so cold that they decided to land. They came down in Poland heavily but safely. They had traveled 1,797 kilometers from London!
1.Three men flew in a balloon _________.
A. more than a century ago B. to visit Poland C. for nearly 1,800 kilometers D. to another city
2.The metal box was used for _______.
A. changing weight B. carrying ropes of the basket
C. keeping drinking water D. carrying the bags of sand
3.When the balloon went up higher, ________.
A.they saw the sun go down B. the temperature of the balloon began to fall
C. they could see a black hole on the ground D. they made a hole in the basket with their knives
4.The balloon landed __________.
A. in a foreign country B. on a lake C. in London D. on the sea
5.The three men had to land because _______.
A.they were very hungry B. they had not enough sand
C. they pulled the box into the basket D. they felt too cold
2.A. 根据“This could hold water. Or it could be empty. So they were able to change its weight.”可知，金属盒里盛的水是并非是饮用水，而是用来改变气球重量的。文中还说他们同时也带了几袋沙子来调节气球的重量。
3.B.根据“It went up to 3,000 meters, and the air was very cold.”或地理常识可断定B为最佳答案。
4.A.如果气球降落在湖上或海上，那将是很危险的，联系“They came down in Poland heavily but safely”，可知A是最佳答案。
5.D.答案源自最后一段中的“They were so cold that they decided to land.”一句。
If you get into the forest with your friends, stay with them always. If you don’t, you may get lost. If you really get lost, this is what you should do. Sit down and stay where you are. Don’t try to find your friends—let them find you by staying in one place.
There is another way to help your friends or other nearby people to find you. Give them a signal (信号) by shouting or whistling (吹口哨) three times. Any signal given three times is a call for help.
Keep up shouting or whistling always three times together. When people hear you, they will know that you are not just making noise for fun. They will let you know that they have heard your signal. They give you two shouts, two whistles, or two gun-shots (枪声). When someone gives you a signal, it is an answer to a call for help.
If you don’t think that you will get help before night comes, try to make a little house---cover up to the holes with branches (树枝) with lots of leaves. Make yourself a soft bed with leaves and grass.
What should you do if you get hungry or need drinking water? You would have to leave your little house to look for a river. Don’t just walk away. Pick off small branches and drop them as you walk so that you can find your way back. The most important thing to do when you are lost is—stay in one place.
1.If you lost in the forest, you should _______.
A.stay where you are and give signals three times
B.walk around the forest and shout so that your friends could hear you
C.try to find your friends as soon as possible
D.try to get out of the forest and shout for help
2.If you want to let people believe that you are not just making noise for fun, you should _______.
A. tell people that you are lost B. keep up shouting or whistling
C. shout at the top of your voice D. shout or whistle three times
3.When you hear two shouts, or whistles, or gunshots, __________.
A. you should shout more loudly B. you can whistle three times
C. it is an answer to your call for help D. you should try to run to them
4.When you want to leave your place to get drinking water, you should ________.
A.just go to the river
B. find some glasses or bottles before you go
C. make a fire so that you can have some tea
D. leave marks so that you can find your way back
5.This passage mainly tells you __________.
A.when you hear a signal always three times, it is a call for help
B.What you should do if you get lost in a forest
C.any signal given twice means an answer to a call for help
D.how you can live longer in a forest
1.A。“Sit down and stay where you are.”和“Give them a signal by shouting or whistling three times.”是解答本小题的关键句子。
2.D。该题的答案源自“Keep up shouting or whistling always three times together. When people hear you, they will know that you are not just making noise for fun.”一句中。
3.C。“They give you two shouts, two whistles, or two gun-shots. When someone gives you a signal, it is an answer to a call for help.”是答案的出处。
4.D。根据“Don’t just walk away. Pick off small branches and drop them as you walk so that you can find your way back.”可知“当你离开原地去找水喝时，不要径直走开，要在路上留下标记，以便能找到回到原地方的路。”
5.B。由文章末句“The most important thing to do when you are lost is—stay in one place.”和开头的“…this is what you should do.”可不难得出答案。