如图,□ABCD的周长是22 cm,△ABC的周长是17 cm,则AC的长为 ( )
A:5 cm
B:6 cm
C:7 cm
D:8 cm
如下图所示的过程,正常情况下在动植物细胞中都不可能发生的是
Each of us is likely to develop a personal _______ for certain types of entertainment.