单项选择题Which is the main idea of the passage
单项选择题According to the passage, one solution to the extinction of many fish species is that ______.
单项选择题It can be inferred from the first paragraph that ______.
单项选择题All of the following are mentioned as factors threatening seafood EXCEPT ______.
单项选择题The author's attitude towards the opponents of Worm's study is ______.