第24题: [单项选择]Many people believe we are heading for environmental disaster ______ we radically change the way we live. A. but B. although C. unless D. lest 参考答案:C 答案解析:[译文]许多人认为我们将碰到环境灾害,除非我们从根本上改变生活方式。
[题解]连词辨义:but“但是,可是;(用于否定句)而(是)”;although“虽然,尽管;然而”;unless“除非,若不”