Geneticist Olivia M. Pereira-Smith has published her findings on "immortal " cells, that is , cells reproduce by dividing ______.. Q7 r, r0 p; @2 I! W
A indefinitely B occasionally7 ~% I4 L7 n g2 J* |. w
C conclusively D periodically E precisely( ^3 O, L; w1 S$ H* C3 O8 O( v
答案是A。。这道题从哪里可以看出逻辑?