完形(3页).doc

《完形(3页).doc》由会员分享，可在线阅读，更多相关《完形(3页).doc（3页珍藏版）》请在得力文库 - 分享文档赚钱的网站上搜索。

1、-Flight simulator （飞行模拟器） refers to any electronic or mechanical system for training airplane and spacecraft pilots and crew member by simulating flight conditions. The purpose of simulation is not to completely substitute （1） actual flight training but to thoroughly familiarize students with the ve

2、hicle （2） before they （3） extensive and possibly dangerous actual flight training. Simulations also is useful for review and for familiarizing pilots with new （4） to existing craft.Two early flight simulators appeared in England within a decade after the first flight of Orville and Wilbur Wright. Th

3、ey were designed to enable pilots to simulate simple aircraft （5） in three dimensions， nose up or down； left wing high and right low， or vice versa； and （6） to left or right. It took until 1929， however， for a truly effective simulator， the Link Trainer， to appear， devised by Edwin A. Link， a self-e

4、ducated aviator and inventor from Binghamton， New York. （7） airplane instrumentation had been developed sufficiently to permit blind flying on instruments alone， but training pilots to do so involved （8） risk. Link built a model of an airplane cockpit equipped （9） instrument panel and controls that

5、could realistically simulate all the movements of an airplane. Pilots could use the device for instrument training， manipulating the controls （10） instrument readings so as to maintain straight and level flight or （11） climb or descent with no visual reference （12） any horizon except for the artific

6、ial one on the instrument panel. The trainer was modified （13） aircraft technology advanced. Commercial airlines began to use the Link Trainer for pilot training， and the US government began purchasing them in 1934， （14） thousands more as World War II approached.Technological advances during the war

7、， particularly in electronics， helped to make the flight simulator increasingly （15） The use of efficient analog computers in the early 1950s led to further improvements. Airplane cockpits， controls， and instrument displays had by then become so inpidualized that it was no longer feasible to use a g

8、eneralized trainer to prepare pilots to fly anything （16） the simplest light planes. By the 1950s， the US Air Force was using simulators that precisely （17） the cockpits of its planes. During the early 1960s （18） digital and hybrid computers were adopted， and their speed and flexibility revolutioniz

9、ed simulation systems. Further advances in computer and （19） technology， notably the development of virtual-reality simulation， have made it possible to （20） highly complex real-life conditions.1. A. for B. to C. with D. on2. A. concerning B. concern C. being concerned D. concerned3. A. undertake B.

10、 undergo C. underplay D. underuse4. A. models B. modifications C. modifiers D. modica5. A. manifestations B. manipulations C. manifestoes D. maneuvers6. A. yawling B. yawning C. yawing D. yawping7. A. From then on B. From now on C. By now D. By then8. A. considerable B. considerate C. considering D.

11、 considered9. A. for B. in C. with D. on10. A. on the part of B. on the basis of C. on the track of D. on the verge of11. A. control B. controllable C. controlled D. controller12. A. to B. for C. on D. in 13. A. as for B. as to C. as D. for14. A. acquiring B. requiring C. sustaining D. retaining15.

12、A. actual B. realistic C. realizing D. true16. A. except B. except for C. apart from D. but17. A. replenished B. replaced C. replicated D. reposed18. A. electronic B. electric C. electricity D. electron19. A. program B. programmable C. programmed D. programming20. A. resurrect B. reproduce C. resusc

13、itate D. resumeADBBD CDACB CACAB DCADBIt is well known that teenage boys tend to do better 1）_ math than girls， that male high school students are more likely than their female counterparts 2）_ advanced math courses like calculus，that virtually all the great mathematicians 3）_ men. Are women born wi

14、th 4）_ mathematical ability？Or does societys sexism slow their progress？ In 1980， two Johns Hopkins University researchers tried 5）_ the eternal nature/nurture debate. Julian Stanley and Camilla Benbow 6）_ 10，000 talented seventh and eighth graders between 1972 and 1979. Using the Scholastic Aptitud

15、e Test， in which math questions are meant to measure ability rather than knowledge， they discovered 7）_ sex differences. 8）_ the verbal abilities of the males and females 9）_ differed， twice as many boys as girls scored over 500 （on a scale of 200 to 800） on mathematical ability； at the 700 level， t

16、he ratio was 14 to 1. The conclusion： males have 10）_ superior mathematical reasoning ability.Benbow and Stanleys findings， 11）_ were published in “Science”， disturbed some men and 12）_ women. Now there is comfort for those people in a new study from the University of Chicago that suggests math 13）_

17、 not， after all， a natural male domain. Prof. Zalman Usiskin studied 1，366 tenth graders. They were selected from geometry classes and tested on their ability to solve geometry proofs， a subject requiring 14）_ abstract reasoning and spatial ability. The conclusion 15）_ by Usiskin： there are no sex d

18、ifferences in math ability.1.A. atB. to C. of D. about2.A. in tacklingB. tackling C. to tackleD. about tackling3.A. might beB. have beenC. must be D. had been4.A. smaller B. less C. fewerD. not more5.A. to settle B. to set C. settling D. setting6.A. were tested B. have testedC. were testing？D. had t

19、ested7.A. distinct B. instinct C. remote D. vague8.A. Since B. HoweverC. As D. While9.A. scarcely notB. virtuallyC. largelyD. hardly10.A. superficially B. universallyC. inherently？D. initially11.A. as B. that C. which D. all12.A. fewB. not a fewC. not fewD. quite few13.A. be B. wereC. was D. is14.A. none ofB. neither of C. eitherD. both15.A. gotB. gained C. reached D. accomplished1-5 ACBBA 6-10 DADDC 11-15 CBDDC-第 3 页-