2007年江苏省普通高等学校“专转本”统一考试大学英语2007年江苏省普通高等学校“专转本”统一考试大学英语.pdfVIP

2007 “ ” 2007 “ ” 江苏省普通高等学校““专转本””统一考试 大学英语 I 100 I 100 第II卷（共110000分） PartIReadingComprehension 40 PartIReadingComprehension 40 PPaarrttIIRReeaaddiinnggCCoommpprreehheennssiioonn （共4400分） Passageone Passageone PPaassssaaggeeoonnee Under proper conditions, sound waves will be reflected from a hillside or other such obstruction. Sound travels at the rate of about one-fifth of mile persecond. If the hill is eleven hundred feet away, it takes two seconds for the sound to travel o the hill and back. Thus, by timing the interval between a sound andits reflection(theecho),you canestimate thedistanceto anobstruction. Duringword war 2 the British used a practical application of this principle to detect German planes ontheirway tobomb London longbefore theenemy was nearthe target.They usedradiowavesinstead of sound waves, since radio waves can penetrate fog and clouds. The outnumbered Royal Air Force (RAF) always seemed to the puzzled Germans to be lying in wait at the right time and never to be surprised.It was radioechoesmore thananythingelse thatwon theBattle ofBritain. Since the radio waves were used to tell the direction in which to send the RAF planes and the distance to send them (their range of flight, in other words), the device was called radio directing and ranging,andfromthe initialsthe word radarwas coined.() 1.Sound waves reflected fromahill can beusedto estimate the. A. heigtofthe hill B. speedofsound C.distanceto thehill D.intensiteof sound 2.Practical ap