完型填空

　　Passage 1

　　The rocket engine, with its steady roar like that of a waterfall or a thunderstorm, is an impressive symbol of the new space age. Rocket engines have 1 D powerful enough to shoot astronauts 2 C the earth's gravitational pull and 3 B them on the moon. We have now become 4 A in space.

　　Impressive and complex 5 C it may appear , the rocket , which was 6 D in China over 800 years 7 D is a relatively simple device. Fuel that is 8 D in the rocket engine changes 9 B gas. The hot and rapidly 10 C gas must escape, but it can do so only 11 D an opening that 12 D backward. As the gas is 13 D with great force, it 14 D the rocket in the 15 C direction. Like the kick of a gun 16 B it is fired, it 17 C the laws of nature 18 A by Sir Isaac Newton when he discovered that " 19 D every action , there is 20 B equal and opposite reaction."

　　1. D. proved 2. C. beyond 3. B. land 4. A. travelers 5.C. as

　　6.D. invented 7. D. ago 8. D. burned 9. B. into 10. C. expanding

　　11. D. through 12. D. directs 13. D. radiated 14. D. pushes 15. C. opposite

　　16. B. when 17. C. follows 18. A. described 19. D. for 20.B. an

　　Passage 2

　　For the past two years, I have been working on students' evaluation of classroom teaching. I have kept a record of informal conversations 1 A some 300 students from at 2 B twenty-one colleges and universities. The students were generally 3 D and direct in their comments 4 C how course work could be better 5 A . Most of their remarks were kindly 6 C with tolerance rather than bitterness and frequently were softened by the 7 C that the students were speaking 8 D some, not all, instructors. Nevertheless, 9 B the following suggestions and comments indicate, students feel 10 A with things-as-they-are in the classroom.

　　Professors should be 11 C from reading lecture notes. "It makes their 12 A monotonous(单调的)." If they are going to read, why not 13 D out copies of the lecture. Then we 14 D need to go to class. Professors should 15 D repeating in lectures material that is in the textbook. " 16 A we've read the material, we want to 17 C it or hear it elaborated on, 18 B repeated." "A lot of students hate to buy a 19C text that the professor has written 20 D to have his lectures repeated."

　　1. A. involving 2. B. least 3. D. frank 4. C. on 5. A. presented

　　6. C. made 7. C. case 8. D. with 9. B. as 10. A. dissatisfied

　　11. C. discouraged 12. A. voices 13. D. give 14. D. shouldn't 15. D. avoid

　　16. A. Once 17. C. discuss 18. B. not 19. C. required 20. D. only

　　Passage 3

　　Rumor is the most 1 A way of spreading stories by passing them on from mouth 2 B mouth. But civilized countries in normal times have better 3 C of news than rumor. They have radio, television, and newspapers. In times of stress and 4 A , 5 B , rumor 6 A and becomes widespread. At such 7 C the different kinds of news are in 8 B , the press, television, and radio versus the grapevine. Especially 9 A rumors spread when war requires censorship(审查，检查)on many important matters. The customary news sources no longer 10 C enough information. Since the people cannot learn 11 A legitimate(合法的，正规的)channels all 12 D they are anxious to learn, they pick up "news" 13 A they can and when this 14 C , rumor thrives.

　　Rumors are often repeated 15 B by those who do not believe the tales. There is a fascination about them. The reason is 16 A the cleverly designed rumor gives expression to something deep in the hearts of the victims--the fears, suspicions, forbidden hopes, or daydreams which they hesitate to 17 B directly. Pessimistic(悲观的)rumors about defeat and disasters show that the people who repeat them are 18 D and anxious. 19 C rumors about record production or peace soon coming point to complacency(满足，自得)or confidence and often to 20 A .

　　1. A. primitive 2. B. to 3. C. sources 4. A. confusion 5. B. however

　　6. A. emerges 7. C. times 8. B. competition 9. A. do 10. C. give out

　　11. A. through 12. D. that 13. A. wherever 14. C. happens 15. B. even

　　16. A. that 17. B. voice 18. D. worried 19. C. Optimistic 20. A. overconfidence