According to the passage, what is most important in solving this awkward problem? A．Reducing the number of the sea lions. B．Recognizing whether the sea lions are the main threats to the salmon. C．Banning the catch of the fish in the Columbia River. D．Forming a good habit of catching fish.
A.Reducing B. B．Recognizing C. C．Banning D. D．Forming E.
【参考答案】
B 根据题干关键词定位至最后一段第一句，akeyissue是“关键问题”的意思，即题干mostimportant......