第一段词汇解析①boulders = large stones or rocks。②perturbed = worried。③underestimated = guessed that difficulties were not as bad as they really were。第二段词汇解析①bumped = moved along in an uneven way。②swerved = moved quickly in one direction, then in another。③hammered = hit repeatedly。④ominously = as if giving a warning that something unpleasant is going to happen。第三段词汇解析①what a relief it was，是感叹句，一般是 what+a/an+adj.+单数可数名词+主语+谓语，当然，也可以接复数名词和不可数名词，但是 how 引导则只能接单数名词，不能接复数名词和不可数名词。当单数时可互换， How interesting a story it is!=What an interesting story it is!特别注意语序。②in response to，作为……的回应。Notes 学习笔记词组归纳1.get sb. to drive2.come from3.even though4.be pitted with5.no sense of danger6.no matter what7.scoop up8.sooner or later9.petrol tank10.look back11.a trail of12.give way to a stretch of13.in response to14.get out15.in the car16.have no effect17.go into a low gear18.at a terrifying speed19.be back20.charge at21.in the middle22.come to a grinding halt