A:可能是高等植物
B:一定不是噬菌体
C:有可能是烟草花叶病毒
D:有可能是原核生物
y1
y2
合计
x1
a
21
73
x2
2
25
27
b
46
100
—Whose book is this? There is no name on it. —Let me see. Oh, it's . I lost it a few days ago.