A:2
B:3
C:4
D:5
下列文学常识的表述不正确的一项是( )
a蓝藻;b绿藻;c发菜;d念珠藻;e颤藻;f紫菜;g硝化细菌;h酵母菌;i链球菌;j噬菌体;k青蛙;l蘑菇
m支原体n衣原体.
The task is very difficult. I wonder whether we will be able to finish it in the ________ of any other helpers.