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问题 单项选择题

当负载转矩一定时，若在串励直流电动机的电枢绕组两端并联一个阻值较大的电阻，那么电动机的转速将会（）。

A、不变

B、下降

C、上升

D、不确定

答案

参考答案：B

选择题

北回归线和北极圈之间的地区是：

A．热带

B．北温带

C．南温带

D．北寒带
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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：
该行多一个词：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：在缺词处加一个漏字符号（∧），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。
      My aunt lives in a village far from my town.                    　　
Last year she came to visit us and took me a               
little dog for my birthday present. It was a little black     
dog with white spots on. It was so lovely that I           
liked it at once. Every day after school I played the        
dog and it gave me much more pleasure. I was glad          
to have it as my companion. One day the dog went away        
and never came back again. All my families were out searching  
for it but it was nowhere to found. How I worried              
about it all those days. A week later a letter came about      
my aunt saying that a little dog had returned                
1._________            
2._________      
3._________          
4._________        
5._________        
6._________                                          
7._________       
8._________           
9._________       
10._________      
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