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Astronomy 完型填空：每小题2分,共20分 Planets are the largest objects that circle around the stars. They may be rocky, 21 the earth, or made mostly of gas and 22 , like Jupiter. The word planet is Greek 23 “wanderer”. The name comes from the 24 planets appear to move against the stars over time. It is thought that the planets formed at about the same 25 as the sun. Over several million years, the dust and gas 26 together to form the planets and moons. Solider rocks gathered near the sun and lighter gases farther 27 . Our planet, the earth, is a large 28 of rocks and metals covered with water and soil. It 29 a group of nine planets that move around a star called the sun. It is 30 by a blanket of gases called the atmosphere, has one moon, and as far as we know, is the only planet that supports life. 21. A. like B. as C. such as D. for example 22. A. liquid B. solid C. rock D. water 23. A. towards B. to C. as D. for 24. A. method B. way C. manners D. means 25. A. time B. place C. reason D. year 26. A. formed B. put C. worked D. gathered 27. A. in B. out C. up D. down 28. A. cloud B. world C. ball D. box 29. A. makes up B. breaks up C. belongs to D. comes to 30. A. forced B. floated C. buried D. surrounded A Even if you are a good high-jumper, you can jump only about seven feet off the ground. You cannot jump any higher because the earth pulls you hard. The pull of the earth is called gravity. You can easily find out the pull of the earth. If you weigh yourself, you will know how much gravity is pulling you.
Since there is gravity, water runs downhill. When you throw a ball into the air, it falls back down. Because of gravity, you do not fall off the earth as it whirls (旋转) around. Then, can we get away from the earth and go far out into space? Now you can do it, because spaceships have been invented. Then spaceship will go so fast that it can escape the earth’s gravity and carry you into space. 41. In this passage, the word “gravity” means. A. the pull of everything. B. the force of attraction among objects. C. the force which attracts objects towards the centre of the earth D. the force which attracts the earth towards the sun. 42. When you slip(滑) you always fall to the ground because A. the earth always turns round. B. the earth has gravity C. the earth’s gravity is greater than your weight. D. you are careless. 43. Gravity is strong that A. it can throw a ball into the air. B. it makes you jump only seven feet. C. it can let you fly away from the earth. D. it can keep everything on earth. 44. Because of gravity, A. water flows everything. B. we can go everywhere by ship. C. water always flows downwards. D. fish can live in water. 45. We can get away from the earth by spaceship because A. the spaceship goes very fast. B. the earth can’t pull the spaceship. C. the spaceship has a strong force. D. the spaceship can jump higher than other things. B There is a place on our earth where hot water and steam come up under the ground. It is on a large island in the Pacific Ocean. The island is North Island in New Zealand. The planet on which we live is a bal1 of very hot rock. It is a good thing for us that the outside shell (壳) is cold. If it were not, no one could live here. The earth's shell has cracks in it in some places. In New Zealand this shell seems to have more cracks than in other places on the earth. There are spots where the ground is so hot that it burns the bottom of your shoes. In some places, hot water shoots into the air from time to time. At other points, you can see steam coming up from pools of hot water. The peop1e who live in these places make use of the heat that comes from inside the earth. Some of them cook in the hot pools. They put food into a basket and place it into the water. Washing clothes is done in much the same way. Many people bring the hot water from below the earth into their homes. They do this by putting a pipe a hundred feet or more into the ground. In this way they get hot water and steam for cooking and washing, and for heating their homes. 46. Our planet is a ball of ________. A. hot rock B. cold rock C. hot steam D. cold water 47. What does the word cracks mean in Chinese? A. 洞 B. 爆炸 C. 蒸汽 D. 裂缝 48. The pools in New Zealand are heated by ________. A. the sun B. hot underground rocks C. oil D. coal 49. In New Zealand the earth's heat ________. A. hurts many people B. shoots into the air C. is put to good use D. is not used at all 50. Which of the following is the best title for the passage? A. Strange Hot Water and Steam B. Coal, Oil, Gas and Heat C. Make Use of Heat D. Heat Under Your Feet C Planet Hunter When Geoff Marcy was 14, his parents bought him a telescope. Every night, he would go onto the roof outside his window to see the wonders of the sky. “What excited me most was whether there were planets in other solar systems where life might
