Question

完形填空 　　Science seems to be getting closer to answering a very old mystery．Homing pigeons信鸽)can be 　　1　　 hundreds of miles from their homes．When they are let to go to 　　2　　 again, they find their way home．Because of this special ability to 　　3　　, pigeons have been used 　　4　　 messengers for hundreds of years． 　　Today people even breed homing pigeons for 　　5　　 at a sport．The birds are shipped to some chosen 　　6　　 a few hundred miles away．Then all of them are let to go together．The winner is the bird that gets home 　　7　　．A good race can make it home from 500 miles away 　　8　　 a single day． 　　The mystery of the homing pigeons is how they 　　9　　 directions and how they find home．The first part seems to be pretty well 　　10　　, and we know of two ways that pigeons tell directions．First, they use the sun．Experiments show that homing pigeons can tell 　　11　　 by the sun．What happens when the 　　12　　 is darkly overcoat by clouds and no one can 　　13　　 where the sun is?Then the pigeons still find their way home． 　　Naturally, people have wondered whether pigeons might have a built in compass(指南针)－　　14　　 that would tell them about the direction of the 　　15　　 magnetic(磁的)field．Many different kinds of experiments were 　　16　　．Here's what the scientists decided 　　17　　 they had made experiments many times．When pigeons can see the sun, they use it as their 　　18　　 means of direction-finding．When they can't see the sun, they use some 　　19　　 way to sense direction from the earth's magnetic field． 　　But how do pigeons know 　　20　　 direction is toward home?What do they use that we would call a map?These are other questions to be answered． (1) [　　] A． carried B． taken C． shipped D． brought (2) [　　] A． escape B． get C． fly D． run (3) [　　] A． find home B． sense directions C． send messages D． make friends (4) [　　] A． by B． as C． for D． to (5) [　　] A． performing B． directing C． showing D． racing (6) [　　] A． place B． port C． island D． country (7) [　　] A． fast B． quickly C． safely D． first (8) [　　] A． on B． at C． in D． over (9) [　　] A． tell B． recognize C． realize D． know (10) [　　] A． explained B． answered C． shown D． understood (11) [　　] A． courses B． roads C． directions D． ways (12) [　　] A． sun B． heaven C． land D． sky (13) [　　] A． see B． find C． notice D． observe (14) [　　] A． anything B． something C． someone D． anyone (15) [　　] A． earth's B． sun's C． planet's D． destination's (16) [　　] A． carried B． done C． taken D． had (17) [　　] A． before B． when C． while D． after (18) [　　] A． important B． major C． main D． most (19) [　　] A． quick B． strange C． special D． easy (20) [　　] A． what B． where C． how D． which

Answer 1

答案：1．B;2．C;3．A;4．B;5．D;6．A;7．D;8．C;9．A;10．B;11．C;12．D;13．A;14．B;15．A;16．B;17．D;18．C;19．C;20．D;
解析：

(1)	本题考查动词的区别与用法；信鸽能被带到(take)离家几百英里远的地方．
(2)	当这些信鸽再次被放飞(fly)时，它们能找到回家的路．
(3)	与上文中的 “When they are let to go to fly again, they find their way home．”对应．
(4)	由于信鸽觅路回家的特异功能，因此几百年以来它们一直被当作(as)信差．
(5)	与下文中的“A good race can make it home from 500 miles away in a single day．”对应．
(6)	人们用船把这些信鸽带到几百英里远的某一选定的地点(some chosen place)放飞．
(7)	第一只(最先first)回家的信鸽便是获胜者．
(8)	一个好的赛事安排会使信鸽在一天之内(in a single day)从500英里远的地方飞回老家．
(9)	与下文的“…and we know of two ways that pigeons tell directions．”对应．
(10)	与下文的“These are other questions to be answered．”对应．
(11)	与上文的“…and we know of two ways that pigeons tell directions．”对应．
(12)	当天空(sky)被乌云所覆盖时．
(13)	由下文“When pigeons can see the sun…”可知．
(14)	something指代前面的a built in compass．
(15)	与下文的“…to sense direction from the earth's magnetic field．”对应．
(16)	“做实验”要说do experiments．
(17)	由上下文逻辑关系可知，多次实验之后(after)，科学家们才得出了一些结论．
(18)	当信鸽能看到太阳时，它们便把太阳作为分辨航向的主要(main)手段．
(19)	由上文可知，在阴云密布的天气里，信鸽凭借一种特殊的方法来分辨航向．
(20)	本句意为“但是，信鸽是如何知道哪个方向(which direction)是回家的方向呢？”