题目内容：
Why is it a problem if all the smaller fish species die?
A. It's not healthy for the environment.
B. People only like to catch big fish.
C. There are too many small fish.
D. The smaller fish can get lost in the lake.
参考答案：【答案仅供学习，请勿对照自行用药等】
选择题：Why is it a problem if all the smaller fish species die?
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