细菌没有真正的细胞核．______．
细菌的结构有细胞壁、细胞膜、细胞质、遗传物质等结构，虽没有成形的细胞核，但是遗传物质同样能传递遗传信息．
故答案为：√
191. Things went well for him during his early life but in middle age his__________seemed to change.
A．chance
B．success
C．way
D．Luck
下列现象属于液化现象的是（ ）
A．夏天，装有冰水的杯子外表面会“出汗”
B．电灯泡用久了会变黑
C．冰雪消融
D．结冰的衣服会变干
