问题 选择题

关于生活中常见的和“影”字有关的物理现象,下列说法中正确的是(   )

A.太阳光下的“树影”是由于光的直线传播形成的

B.岸边的人在水中所成的“倒影”是由于光的折射形成的

C.“摄影”用的照相机是根据凹透镜成像的原理制成的

D.放电影时,屏幕上的“影像”能被所有观众看到是利用了光的镜面反射

答案

答案:A

题目分析:知道常见的三种光现象:①在生活中,激光准直、小孔成像、影子的形成、日食月食的形成等都表明光在同一种均匀介质中是沿直线传播的;②光照射到两种物质界面上时,一部分光被反射回原来介质中继续传播的现象是光的反射,现象有:平面镜成像、水中倒影等;③当光从一种介质斜射入另一种介质时,传播方向发生改变,这是光的折射,现象有:看水里的鱼比实际位置浅、彩虹、透镜成像,海市蜃楼等。

A、太阳光下的“树影”是由于光的直线传播形成的;故A正确;

B、水中山的倒影,是平面镜成像,是由光的反射形成的;故B错误;

C、“摄影”用的照相机,照相机是根据凸透镜成像的原理制成的,属于光的折射,故C错误;

D、光的反射包括:镜面反射和漫反射。镜面反射的反射面光滑,漫反射的反射面凹凸不平。电影院的荧幕做的很粗糙,光线射到上面能发生漫反射,使坐在电影院的任一角落里,都能看清屏幕上的图象,故D错误.

完形填空
完形填空。
     It was Thanksgiving morning and in the crowded kitchen of my small home I was busy preparing the
traditional Thanksgiving turkey when the doorbell rang. I 1 the front door and saw two small children in 
2 huddling(挤作一团)together on the top step.
     "Any old 3 , lady ?"asked one of them. I was busy. I wanted to say "no" until I looked down at their
feet. They were 4 thin little sandals(凉鞋), wet with heavy snow.
     "Come in and I'll make you a cup of hot 5 ".
They walked over and sat down at the table. Their 6 sandals left marks upon the floor I served them
coffee and bread with jam to fight against the cold 7 . Then I went back to the 8 and started again on
my household budget.
     The silence in the front room 9 me, so I looked in. The girl held the 10 cup in her hands, looking at it.
The boy asked in a flat 11 ,"Lady, are you rich?" "Am I rich? Mercy, no!"I looked at my shabby slipcovers(破旧的沙发套). The girl 12 her cup back in saucer(茶托)carefully and said, "Your 13 match you saucers. "Her voice was hungry with a need that large amount of food could supply. They left after that, 14 their
bundles of papers against the wind. They hadn't said "Thank you". They didn't 15 to. They had reminded
me that I had so much for which to be 16 . Plain blue china cups and saucers were 17 worth five pence.
But they matched.
     I moved the chairs back from the fire and cleaned the living room. The muddy 18 of small sandals were
 19 wet upon my floor. "Let them be for a while, "I thought. Just 20 I should begin to forget how rich I am.
( ) 1.A.opened  
( ) 2.A.needs  
( ) 3.A.clothes
( ) 4.A.selling
( ) 5.A.wine    
( ) 6.A.big    
( ) 7.A.upwards
( ) 8.A.kitchen
( ) 9.A.struck  
( )10.A.glass  
( )11.A.noise  
( )12.A.called  
( )13.A.cups    
( )14.A.grasping
( )15.A.dare    
( )16.A.crazy  
( )17.A.well    
( )18.A.road    
( )19.A.already
( )20.A.in case
B.closed    
B.rags      
B.blankets  
B.enjoying  
B.beer      
B.black      
B.outside    
B.bedroom    
B.melt      
B.empty      
B.sound      
B.brought    
B.chairs    
B.holding    
B.forget    
B.mysterious
B.only      
B.images    
B.really    
B.even if    
C.tied      
C.tears      
C.papers    
C.borrowing  
C.tea        
C.wet        
C.downtown  
C.living room
C.moved      
C.valuable  
C.voice      
C.went      
C.plates    
C.catching  
C.need      
C.ripe      
C.quite      
C.prints    
C.never      
C. as        

D.fixed        
D.sickness      
D.toys          
D.wearing      
D.coffee        
D.loose        
D.indoors      
D.dining room  
D.shocking      
D.broken        
D.pronunciation
D.put          
D.slipcovers    
D.taking        
D.regret        
D.thankful      
D.nearly        
D.outline      
D.still        
D.so long as    

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