1、【句子】When it is struck, a tuning fork produces an almost pure tone, retaining its pitch over a long period of time.音叉被敲击时，产生几乎纯质的音调，其音量经久不衰。 【解析】1.strike1)n. 罢工，打击，殴打It was not long before tragedy struck again.没多久，灾难又再次降临。2)v. 打，撞，罢工，划燃The union struck for better work conditions.工会为争取更好的工作条件而罢工。3)str
2、ike, beat, hit, tap, knock辨析strike 常表示用力打或敲hit 有“撞击，袭击”之意，比strike稍弱一些，指一次性的打击或击中beat 指连续多次的打，也指有节奏的击打，还可表示打败tap 指轻拍knock 指敲打并伴有响声，还可表示打倒、撞翻2.tune1)n. 曲调，调子，和谐，协调，数量He played a tune on the violin.他用小提琴演奏了一首曲子。2)vt. 为 . 调音，调整The orchestra tuned their instruments.乐队在给乐器调音。3.pure adj. 纯的，纯洁的，纯粹的Water ca
3、n be made pure by distilling it.水可以通过蒸馏而提纯。She is a pure girl.她是一个纯洁的女孩。4.tone1)n. 语气，音调，调子，色调，风气That violin has a beautiful tone.那支小提琴的音色很美。2)v. 使更健壮，定调，调色，装腔作势地说Exercise tones up the muscles.运动使肌肉强化。4.retain vt. 保持，保留，记住，聘请Her memory retains everything she reads.她过目不忘。5.period n. 一段时间，周期，时期，课时，学时，句号，月经He was on his feet again after such a long period in hospital.住院很长一段时间他复原了。Which period of history are you studying?你正在学哪一段历史？ 【练习】It _ her how quiet and gentle he was.A. beat B. hit C. struck D. knock版权所有：高考资源网()版权所有：高考资源网()
