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A. reproduce in large numbers                       

B. control the temperature where they live   

C. divide the work of their colonies               

D. have a complex defense system   

14. The honeybee’s sting is particularly effective e because it _________.   

A. has many potential uses                            

B. can kill several victims at once   

C. is located in the rear of the bee’s body        

D. remains with the bee’s victim   

15. Which of the following is the most appropriate title for the passage?   

A. The Communal Life of Bees                      

B. The Structure of the Bees   

C. The Organization of Insect Colonies           

D. The Life of Social Insects    

    

Passage Two   

    Unless we spend money to spot and prevent asteroids(小行星) now, one might crash into Earth and destroy life as we know it, say some scientists.   

    Asteroids are bigger versions of the meteoroids(流星) that race across the night sky. Most orbit the sun far from Earth and don’t threaten us. But there are also thousands whose orbits put them on a collision course with Earth.   

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