对处于不同周期时相的细胞，对热疗最敏感的细胞期是（）。

A.G1期

B.S期

C.G2期

D.M期

E.各期细胞敏感性相同

_        late for school again, July.               [ ]

A. Don't to arrive                    

B. Don't arrive              

C. Not to arrive                      

D. Not arriving