Mirages(海市蜃楼)areproducedbyrefraction(折射)oflightwithinalayer(层)orlens(透镜)ofair.ThislayerofairsaysmeteorologistJames.H.Gordonresistsdisruption(混乱)eveninafairlystrong

Question

Mirages( 海市蜃楼 ) are produced by refraction( 折射 ) of light within a layer( 层 ) or lens( 透镜 ) of air. This layer of air says meteorologist James. H. Gordon resists disruption( 混乱 ) even in a fairly strong wind.

Probably the most typical mirage picture is one of a lake in a waterless desert. There may even be the appearance of waves breaking on the shore. The easiest form of mirage to study however is one that has been seen by millions of people—those seeming strips( 条状 ) of water on asphalt-surfaced( 沥青路面的 ) highway go suddenly out of sight when one comes near them.

Gordon says Operation Long Distance as the most puzzling of mirage forms since it  ifies( 使无效 ) a basic law of physics. The law states that the apparent size of an object seems to become smaller as we move away from it; however this kind of mirage will carry a picture of a ship a town or an island a thousand miles and set it up in the sky as big as life.

Mirages may have had an effect on history: a World War Ⅰ story which has not been really verified( 考证 ) deals with a crucial( 决定性的 ) battle between the Turks and the British. Supposedly the stronger Turkish army was gaining the advantage when one of its outposts reported British reinforcements( 援兵 ) advancing. After a hurried conference the Turkish forces withdrew. In reality there were no advancing British troops( 军队 )—what had been reported was a mirage showing men who were a hundred miles away.

1. The air that carries the mirage acts as 　　　　　　    .

A. a lens 　　　　　　　　　　　　　　　　　　　　　　　　　　　　  B. a mirror

C. an absorbent( 吸收剂 ) 　　　　　　　　　　　　　　　　　　　　  D. a camera

2. The strips of water are the easiest form of mirage to study because they 　　　　　　    .

A. can be produced in the lab

B. appear quite often

C. have been noted all over the world

D. do not break up in a light gentle wind

3. The passage states that mirages may 　　　　　　    .

A. be reproduced in several places at the same time

B. be enlarged to huge proportions( 比例 )

C. last for several days

D. be carried a thousand miles

4. The author implies that history might have recorded a different winner in one battle if 　　　　　　    .

A. the Turks had described a mirage correctly

B. British troops had not been advancing

C. a Turkish outpost had not mistaken a mirage for a British advance

D. a British outpost had not reported a distant mirage

 

Answer 1

答案：1A2B3D4C
提示：
1.A  Mirages(海市蜃楼) are produced by refraction(折射) of light within a layer(层) or lens(透镜) of air. 所以本题选A. 2.B The easiest form of mirage to study however is one that has been seen by millions of people—those seeming strips(条状) of water on asphalt-surfaced(沥青路面的) highway go suddenly out of sight when one comes near them. 故B为正确选项。 3.D  this kind of mirage will carry a picture of a ship a town or an island a thousand miles.所以D为正确选项。 4.C  参见文章最后一段。