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问题 不定项选择

如图甲所示，A、B两物体叠放在光滑水平面上，对物体B施加一水平变力F，F-t关系如图乙所示，两物体在变力作用下由静止开始运动且始终保持相对静止，则  

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A．t0时刻，两物体之间的摩擦力最大

B．t0时刻，物体的速度最大

C．t0-2t0时间内，物体之间的摩擦力逐渐减小

D．0-2t0时间内，物体A所受的摩擦力方向始终与变力F的方向相同

答案

ACD

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完形填空。

                                                 I Love You, Mum and Dad!
      Tears go out of my eyes when I talk to my parents on the phone. What are they doing when I call them?
This is what l want to know most.I have supper at 5 o'clock in the dining hall. There is no need for me to
     1    by myself, no need to wash the dishes. However, now it is the busiest time for my parents. Dad works
from seven o'clock in the morning to nine o'clock in the evening. Therefore, all the housework is    2  to my
mum.    3      her own job, she also has to work at the vineyard (葡萄园).
      Every day she gets up at 4 0'clock in the morning, and then works till dark. One day I called her at 7:30 in
the evening, and she told me that she was still in the vineyard and hadn't had supper yet. Tears ran down from      4   cheeks(脸颊),and 1 was filled with     5     . I promise her to study hard in the university, because I am
her hope.I promise her to take care of myself, because I am important to her.…I promise her so much and I
just want her to promise me that she can take care of herself and Dad because they are      6    like the blood in
my body.I cannot      7   without them.
      In my    8     ,everyone is common. We are willing to eam ourliving by our own hands. We are very happy
to have the meal together on the New Year's Eve. My mother has ever said that everyone in the family is
important;no one can be   9    .
     Mum has ever said that the     10     time for Dad and her is when my sister and I come back home. We play
cards in the room,watch TV, do anything we like with Dad and Mum preparing delicious food in the     11   . It
is also the happiest time for me. At that moment, I could forget all the difficulties and unhappiness. The only
thing I would like to do is to  12   the time with my parents.
     Love, sometimes, doesn't need many words. Give your parents a call, and tell them you miss them...

( )1.A.  cook     
( )2.A. done      
( )3 A  With      
( )4.A. my        
( )5.A. regret    
( )6 A.  still    
( )7.A. study     
( )8.A city       
( )9. A.  weak    
( )10. A.  busiest
( )11.A bathroom  
( )12.A enjoy     
B.feed     
B.taken    
B.Besides  
B.his      
B.shame    
B.only     
B.live     
B.lass     
B.sad      
B.happiest 
B.bedroom  
B.find     
C. eat    
C.left   
C As      
C.her    
C.worry  
C. almost 
C.develop
C.family  
C. free   
CIuckiest
C.study  
C.control
D.live     
D.tumed   
D.From    
D.our     
D.trouble 
D.just     
D.succeed 
D.area     
D.absent  
D.easiest 
D.kitchen 
D.get     
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选择题

输卵管结扎以后人体表现为                         (      )

A．能生殖，第二性征消退

B．不能生殖，第二性征消退

C．能生殖，第二性征不消退

D．不能生殖，第二性征正常
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