Kim loại có giới hạn quang điện ${\lambda }_0=0,3\mu m$ . Công thoát electron khỏi kim loại đó là

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  Henry David Thoreau was an American writer who is remembered for his faith in religious significance of the nature.              

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  Amelia Earhart, the first woman to fly solo across the Atlantic, disappeared on June 1937 while attempting to fly around the world.         

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  They asked me how long did it take to get to Paris by train.         

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  I'd prefer to do it on myself  , because other people make me nervous.         

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  It is a good idea to be careful in buying or purchasing magazines from salespersons who may come to your door.  

• Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions:

  A turtle differs from other reptiles in that its body is encased in a protective shell of  their own.    

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  The wooden fence surrounded the factory is beginning to fall down because of the rain.  

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    Foreign students who are doing a decision about which school to attend may not  know exactly where the choices are located.

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  Fertilizer, which is added to the soil to replace or increase plant nutrients, include animal and green manure, fish and bone meal and compost.

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  It is recommended that people to take regular exercise.