如图,晚上小亮在路灯下经过,在小亮由A处径直走到B处这一过程中,他在地上的影子( )
A:逐渐变短
B:先变短后变长
C:逐渐变长
D:先变长后变短
Peter ________ some beautiful postcards to his friends yesterday.
甲 乙