问题 选择题

下列反应属于复分解反应的是(  )

A.Fe2O3+3CO

高温
.
2Fe+3CO2

B.2NaOH+H2SO4═Na2SO4+2H2O

C.3NO2+2H2O═2HNO3+NO

D.H2+CuO

加热
.
Cu+H2O

答案

A、Fe2O3+3CO

高温
.
2Fe+3CO2,该反应的生成物中铁属于单质,不是两种化合物相互交换成分生成两种新的化合物的反应,不属于复分解反应,故选项错误.

B、2NaOH+H2SO4═Na2SO4+2H2O,该反应是两种化合物相互交换成分生成两种新的化合物的反应,属于复分解反应,故选项正确.

C、3NO2+2H2O═2HNO3+NO,该反应不是两种化合物相互交换成分生成两种新的化合物的反应,不属于复分解反应,故选项错误.

D、H2+CuO

加热
.
Cu+H2O,该反应是一种单质和一种化合物反应生成另一种单质和另一种化合物的反应,属于置换反应,故选项错误.

故选:B.

完形填空
完形填空。
     It is Saturday morning. Sue __1__ breakfast. Sue's mother and father are with her. On Saturday
 morning Sue __2__  go to school. She helps her mother and father __3__  home. This morning, she says
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      "Yes, you can, Sue." her mother says, "You can go to Mr. Hunter's __5__.Our clock is __6__  his
 shop."
       "Mr. Hunter mends clock." Sue's father says.
       "Is he __7__  our clock?" Sue asks.
       "Yes." her father says, "And this morning it's ready."
       "Yes, it's ready." her mother says, "__8__  Mr. Hunter's shop, Sue. Take this bag. You can put the
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        Sue takes this bag.
        "Here is eighty pence, Sue." her father says, "Give it to __9__, please."
        "Yes, Daddy." Sue says. She puts the pence in the bag.
        "__10__ , Mummy and Daddy." she says. Sue is happy. She is helping her mother and father.
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( ) 9. A. Mrs. Hunter      
( ) 10. A. Good morning    
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B. Good evening      
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D. Good afternoon    
单项选择题