首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A Canadian researcher has discovered that sound travels 【21】______ air more than one-haft kilometer an hour slower than had been
A Canadian researcher has discovered that sound travels 【21】______ air more than one-haft kilometer an hour slower than had been
admin
2010-06-30
28
问题
A Canadian researcher has discovered that sound travels 【21】______ air more than one-haft kilometer an hour slower than had been believed. The discovery has surprised many engineers and scientists who learned they had been 【22】______ the wrong speed of sound for many years.
The speed of sound in air had been 【23】______ to be three-hundred-thirty-one-point-two-nine meters a second. But Doctor George Wong found, 【24】______ accident, that the speed of sound is only three-hundred-thirty-one-point-one-three meters a second. That is a difference of about sixteen centimeters a second.
Doctor Wong is a member of the National Research Council of Canada. He was studying ways to 【25】______ exactly the sound created by microphones. One of his experiments 【26】______ a number he could use to find the speed of sound. He was 【27】______ to learn that the speed of sound was slower than scientists had thought.
To explain the difference, Doctor Wong spent eighteen months 【28】______ past test research on the speed of sound. He finally found the 【29】______ of the difference. It was a mathematics mistake 【30】______ in Nineteen-Forty-Two by physicist H-C Hardy.
Doctor Wong’s 【31】______ does not mean a big change for the science of sound. This is 【32】______ Doctor Hardy and Doctor Wong measured the speed of sound for what is called " standard air".
Standard air exists only 【33】______ thought. It is a way for scientists to agree 【34】______ the same speed of sound. 【35】______ the air around us, standard air always has a temperature of zero degrees Celsius and the same atmospheric pressure 【36】______ the air at sea level. Standard air al ways have same amounts of nitrogen, oxygen, carbon dioxide and 【37】______ gases. And in standard air, the speed of sound does not change.
The change in the new speed of sound is 【38】______ small to affect the work of most sound scientists and engineers. But scientists say Doctor Wong’s discovery may 【39】______ improve instruments 【40】______ use the speed of sound to measure very short distances.
【27】
选项
A、surprising
B、surprised
C、shocking
D、shock
答案
B
解析
本句意为“他得知声速比科学家们认为的慢后非常吃惊。”A surprising和 B surprised都有令人吃惊的意思,surprising用于物作主语时,而surprised用于人作主语时。
转载请注明原文地址:https://kaotiyun.com/show/ExJd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
Ifyou’vebeenoncampusforverylong,I’mcertainthatyou’vealreadyheardaboutthiscourse.Youmayknowthatlastsemester
Ifyou’vebeenoncampusforverylong,I’mcertainthatyou’vealreadyheardaboutthiscourse.Youmayknowthatlastsemester
Ifyou’vebeenoncampusforverylong,I’mcertainthatyou’vealreadyheardaboutthiscourse.Youmayknowthatlastsemester
Payandproductivity,itisgenerallyassumed,shouldberelated.Buttherelationshipseemstoweaken【C1】______peoplegetolder
Fordecades,postersdepictingrabbitswithinflamed,reddenedeyessymbolizedcampaignsagainstthetestingofcosmeticsonani
FewwritersareasreveredasJaneAusten.AccordingtoapollinMarch,PrideandPrejudice—aromancewithoutasinglekiss—is
WhendidKantbecomeaprofessor?
YouwillhearaconversationbetweenMissGreen,aneducationaljournalist,andProfessorWilson,anexpertineducationalstudi
A、Specialpaths.B、Resurfacedhighways.C、Moreparkingspace.D、Betterstreetlighting.A
GoldwasdiscoveredinCalifornia______.
随机试题
眶蜂窝织炎发病的主要诱因是
A.肝内胆道出血B.门静脉高压症C.消化道溃疡出血D.胃癌出血E.应激性溃疡出血需要行根治性胃大部切除术或全胃切除术的出血是
A毛氏Ⅴ类错牙合B毛氏Ⅱ类3分类错牙合C毛氏Ⅲ类1分类错牙合D毛氏Ⅱ类1分类错牙合E毛氏Ⅳ类2分类错牙合
下列哪种诊断技术诊断心包积液既安全又准确
患者,男,30岁。咽疼、咳嗽、发热,2周后发现尿色红,眼睑水肿,24小时尿量1000ml。体检:全身皮肤未见皮疹,血压150/100mmHg。化验:尿蛋白(++),红细胞每高倍视野0~60,ALB32g/L,Scr123μmol/L。上述临床表现最可能
怎样区分构件与零件?
企业合并对价分摊事项涉及的评估业务所对应的评估对象应当是()。
Youaregoingtoreadalistofheadingsandatext.Choosethemostsuitableheadingfromthelist[A]to[G]foreachnumberedpar
WhydoesOldFreddosomethingstupid?
NoEnglishmanbelievesinworkingfrombooklearning.Hesuspectseverythingnew,anddislikesit,unlesshecanbecompelledb
最新回复
(
0
)