A:1/2
B:1/(2n-l)
C:1/2n
D:1
江南历史悠久,物产丰饶,景色优美,人才辈出。我们热爱祖国,也要热爱自己的家乡。据此回答以下问题:
下列四个图形分别是四届国际数学家大会的会标,其中属于中心对称图形的有( )
One day Eddie and Hobo looked at the ____. Eddie thought he saw a____but Hobo thought it was a ____. Because Hobo saw one ____. Eddie thought there were many bright ____and it was too____, so it couldn't be a plane.