细胞核在坏死时可能出现()
A．染色变淡
B．染色质浓缩
C．DNA分解
D．核膜破裂
E．上面四种情况均可出现
参考答案：A, B, C, D, E
Of the two coats, I’d choose the __________ one to spare some money for a book.
A．cheapest
B．cheaper
C．more expensive
D．most expensive
精子进入人体到形成受精卵所经历的途径是：
A． * * —子宫－输卵管
B． * * －子宫内膜
C． * * －输卵管－子宫内膜
D．输卵管－子宫内膜
