— At last, both of them died in the war.
一 Oh. that's touching.
A:Finally
B:Sadly
C:Quickly
I have English dictionary and it helps me a lot.
人类的遗传病多种多样,一部分是致病基因引起的,当致病基因是____基因纯和时,个体表现为有病.
张宁用图甲所示的装置测出凸透镜的焦距,并“探究凸透镜成像规律”,当蜡烛、透镜、光屏位置如图乙时,在光屏上可成清晰的像.下列说法正确的是( )