一个细胞核中有20条染色体的细胞,在连续进行两次分裂后,产生的子细胞中有染色体[ ]
A.10条
B.20条
C.30条
D.40条
答案:B
.______himself to children’s charity work, the famous actor missed _________from a terminal disease.
A.Devoted ; being saved
B.Devoting; being saved
C.Devoted; to be saved
D.Devoting; to be saved
常温贮存不适用于下列()食品。
A.调味品
B.蔬菜
C.切开的水果
D.盐