9;0~4;5~9;5~9
His father came home at midnight, and _____,he was drunk.
A.as a result
B.that is to say
C.what’s more
D.sooner or later
关于倒位的描述正确的是( )。
A.染色体上的基因有丢失
B.染色体只发生一次断裂
C.染色体两臂均断裂断片互换
D.染色体旋转180度
E.以上都不对