题目内容

10．Your classroom is very clean．
 Yes，it ______ every day．（　　）
A．is cleanedB．cleansC．is cleaning

分析 -你们的教室很干净．
-当然了，它每天被打扫．

解答 答案：根据题干中的部分it ______ every day联系上句可知it在这里代指classroom，做句子的主语，结合选项中的动词clean可知，主语由物充当，它是动词clean的动作承受者，应该是教室被人打扫，表被动，所以此处应用被动语态；根据时间状语every day可知此句应用一般现在时态；两者综合可知此句应该用一般现在时的被动语态去完成，其构成为am/is/are+动词的过去分词；主语为单数it，所以助动词用is．故选A．

点评 此类题型主要是确定句子主语和谓语的关系，如果是主动关系就用主动语态；反之如果是动宾关系则要用被动语态；还要注意时态的确定．两者有机结合就能做出正确的选择．

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11．Thomas Edison lit up the world with his invention of the electric light．Without him，the world might still be in the dark．However，the electric light was not his only invention．He also invented the motion picture camera and 1200 other things．About every two weeks he created something new．
    Thomas Edison was born in 1847．He attended school for only three months．His mother taught him at home，but Thomas was mostly self-educated．He started experimenting at a young age．
    When he was 12 years old，he got his first job．He became a news boy on a train．He did experiments on the train in his spare time．Unluckily，his firstwork experience did not end well．They firedhim when he accidentally set fire to the floor of the train．Then Edison worked for five years as a telegraph operator，but he continued to spend much of his time in experimenting his first patent（专利权） in 1868 for a vote recorder run by electricity．
     Thomas Edison was totally deaf in one ear and hard of hearing in the other，but he thought of his deafness as a blessing in many ways．It kept conversations short，so that he could have more time for work．He always worked 16 out of every 24 hours．Sometimes his wife had to remind him to sleep and eat．
    Thomas Edison died at the age of 84．He left a great many inventions that greatly improved the quality of life all over the world．

46．How often did Edison make a new invention？A
A．About every fourteen days     
B．Aboutevery seven days    
C．About once aweek      
D．About twice a week
47．The underlined word"fired"in the passage means"D"
A．Gave somebody a job          
B．Setfire to somebody   
C．Let somebody down           
D．Forced somebody to leave his job
48．Edison considered his deafness asB．
A．something bad           
B．a gift from god        
C．a kind of ability        
D．a disadvantage
49．which of the following sentence is NOT true according to the passage？C
A．Edison had only 8 hours rest each day after his deafness        
B．Edison got his education mostly by self-teaching
C．Edison had his first job in 1869                  
D．Edison's inventions greatly improved the quality of people's life
50．What does the passage mainly talk about？D
A．The function of the electric light       
B．Edison and his experiments 
C．The importance o f inventions            
D．The whole life of Edison．
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