What do you do ? I have dinner.
A:at eight o`clock in the afternoon
B:in the afternoon at eight o`clock
C:at the afternoon in eight o`clock
名著阅读与口语交际。
如图,⊙O中,AB是直径,半径CO⊥AB,D是CO的中点,DE∥AB,求证:EC∧=2EA∧.