如图为一个生态系统中四种生物所占的数量关系，这些生物构成了一条食物链．下列说法正确的（  ）

A: Hi, Li Jun. You were not at school yesterday. ____ 
B: Oh, I had a headache and I had to ask for a sick leave.
A: Sorry to hear that. ____ 
B: Yes, my mother took me to the hospital.
A: ____ 
B: The doctor checked me over and said I had a cold.
A： ____ 
B: Yes, a little. The doctor told me to take the medicine three times a day and have plenty of water.
A: ____  
B: Yeh. Thank you.
A; You’re welcome.

8米的 $\frac{1}{9}$ （   ）9米的 $\frac{1}{8}$。