第31题: [单项选择]Weather forecasting was of vital (important) in the seafaring (and agricultural) lives (led by) the seventeenth-century European colonists (in what) is now the United States. 参考答案: 答案解析:important--importance.vital important两个形容词在一起,不对。有人错选D,那是因为受了in what两个词杠在一起的迷惑。应该是in (what is now)th