问题 不定项选择

如图所示,水平传送带上有一物体与传送带相对静止,并一起向右运动。则下列说法正确的是

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A.物体可能不受摩擦力

B.摩擦力可能向左也可能向右

C.物体受的摩擦力一定向右

D.物体受的摩擦力一定不为零

答案

AB

改错题
短文改错。
     此题要求改正所给短文中的错误。对标有题号的每一行作出判断:
如有错误(每行只有一个错误),则按下列情况改正:
此行多一个词:把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉。
此行缺一个词:在缺词处如一个漏字符号(∧),在该行右边横线上写出该加的词。
此行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。
注意:原行没有错的不要改。
Dear Grandpa,                                               
     Thank you for your letter,                                  
     My school is organizing a basketball team and               
there's just a chance which I can join it. I’m little of   
course, but terribly quick and bravely. While the others   
are jumping about in the air, I can run under my legs     
and get the ball. It will be lots of fun for practicing out 
in the playground in the afternoon with the tree           
around us all red or yellow and everybody laughing       
and shouting. These are  the happier girls I’ve ever      
seen and I’m the happiest in all !                       
     I meant to write long letter and tell you all the          
things I’m doing at school, but the bell was ringing,     
so I just have to stop here.                                
Love,                                                       
Judy                                                        
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单项选择题