问题 选择题

下列说法正确的是         。(填正确答案标号。选对1个得3分,选对2个得4分,选对3个得6分。每选错1个扣3分,最低得分为0分)

A.如果质点所受的力与它偏离平衡位置的位移的大小的平方根成正比,并且总是指向平衡位置,质点的运动就是简谐运动

B.向人体内发射频率已知的超声波被血管中的血流反射后又被仪器接收,测出反射波的频率变化就能知道血流的速度,这种方法俗称“B超”

C.含有多种颜色的光被分解为单色光的现象叫做光的色散,光在干涉、衍射及折射时都可以发生色散

D.麦克斯韦关于电磁场的基本观点是:变化的磁场产生电场和变化的电场产生磁场E.狭义相对论表明物体运动时的质量总是要小于静止时的质量

答案

BCD

题目分析:如果质点所受的力与它偏离平衡位置的位移的大小成正比,并且总是指向平衡位置,质点的运动就是简谐运动,故A错误;根据多普勒效应,可以向人体内发射频率已知的超声波被血管中的血流反射后又被仪器接收,测出反射波的频率变化就能知道血流的速度(这种方法俗称“B超”),故B正确;由于不同颜色的光的波长不同,通过同种介质的折射程度不同,含有多种颜色的光被分解为单色光的现象叫做光的色散,光在干涉、衍射及折射时都可以发生色散,故C正确;麦克斯韦电磁场理论的两个基本论点是:变化的磁场产生电场,变化的电场产生磁场,从而预言了电磁波的存在,故D正确;狭义相对论表明物体运动时的质量总是要大于静止时的质量,故E错误。

完形填空
完形填空。
     The first event of my life to be printed into my memory occurred when I was three. My mother stands,
working in the  1   and then glances at me with a   2   smile. Two feet down the table, I knock on a chair with
a bowl and a spoon,   3   my own invisible (无形的) powder. We wear   4   dresses, mine the leftover   5   from
hers, sky blue-mommy's favorite color. I am her shadow.
     However, by 14 I could not   6   my mother. All that I heard every day was no.I wanted to dye my hair and
she said no. I wanted to   7   late with my friends and she said no. I didn't understand why she said no. She was
trying to  8   me from aches and pains and mistakes   9   in her teens. Several years later, I finally understood her, but it was too late. She became ill. I cried and  10  ,"Don't take her, God, please! She is my mother, my mommy
, the woman who gave me life. All my years,   11   the bad times and the good, she has been there,  12   to me
forever by an invisible umbilical cord (脐带) that lasts longer after birth." But this cord, this love could do nothing to stop the cancer from  13  .
      A few years later  14   I myself lay in the hospital bed, my newly born daughter was   15   in my arms. cried
and smiled and prayed. Please help me to   16   her into a wonderful girl. And looking down   17   her eyes, I
could see the message they held, "Your   18   would be proud."
     I stand in the kitchen now, and these thoughts flashed through my mind. I glance at my young daughter. A
   19   feeling rushes through my soul as I take in the familiar  20  . I am my mother's shadow.
( ) 1. A. kitchen    
( ) 2. A. lovely     
( ) 3. A. preparing  
( ) 4. A. same       
( ) 5. A. material   
( ) 6. A. stand      
( ) 7. A. keep up    
( ) 8. A. save       
( ) 9. A. watched    
( )10. A. screamed   
( )11. A. through    
( )12. A. connected  
( )13. A. spreading  
( )14. A. when       
( )15. A. placed     
( )16. A. change     
( )17. A. for        
( )18. A. daughter   
( )19. A. warm       
( )20. A. saying     
B. dining room
B. lively    
B. mixed     
B. similar   
B. clothes   
B. agree     
B. keep on   
B. warn      
B. liked     
B. said      
B. in         
B. shared    
B. growing   
B. before    
B. given     
B. support   
B. through   
B. mother    
B. strange   
B. scene     
C. sitting room  
C. loving        
C. mixing        
C. different     
C. dress         
C. know          
C. stay up       
C. help          
C. heard       
C. shouted     
C. on            
C. concerned     
C. escaping    
C. since         
C. thrown        
C. bring         
C. up            
C. children      
C. painful       
C. drawing     
D. garden     
D. horrible   
D. prepared   
D. matching   
D. clothing   
D. realize    
D. stay out   
D. stop       
D. experienced
D. prayed     
D. within     
D. joined     
D. moving     
D. then       
D. taken      
D. raise      
D. into       
D. friends    
D. exciting   
D. paint                     
多项选择题