必修3弟四单元学生用.doc

Unit 4 Astronomy the science of the stars 第一部分：单词精讲 system n. 系统，制度；方法，方式；体系 They have an alarm system in the house. 他们的房子里装有一套报警系统。 The legal systems operate very differently in these countries. 这些国家的法律制度运作方式迥异。 【知识拓展】systemic adj. 系统的，体系的 systematic adj.有系统的，有条理的 systematize vt. 使系统化，使条理化 theory n.理论，学说 This theory should be proved before it is used. 在运用这个理论之前要对它进行论证。 【知识拓展】in theory 理论上 （反：in practice/reality/fact 实践中，实际上，事实上） 【一言辨异】Your plan is good in theory, but doesn’t work in practice. 你的计划在理论上不错，但实践起来行吗？ violent adj. 使用暴力的，暴力引起的，厉害的，狂暴的 More and more young people are involved in violent crimes, which worries partents. 越来越多的年轻人参与暴力犯罪，这使父母很担心。 They had a violent quarrel over Dave’s drinking. 因为戴夫喝酒，他们有了激烈的争吵。 【知识拓展】do violence to 对……行凶，粗暴对待 take…by violence 抢夺…… lay violent hands on…对……下毒手 in time 及时，终于，总有一天 I intended to catch the early bus, but I didn’t get up in time. 我原打算乘早班车，但我没有及时起来。 【知识链接】on time准时 all the time 一直，始终，总是 at a time 一次，同时 at one time曾经 at the time当时，那时 【活学活用】1.Bob got seriously injured in the traffic accident, but fortunately, the doctor came_____ to save his life. A. in time B. on time C. at last D. for sure 2.Fred and jim did not like each other at first, but_____ they became fridents. A.on time B.at one time C.all the time D.in time 5.unlike 不同，不像 (1) unlike作介词，意“不像，不同”，相当于different from Music is quite unlike any other art forms. 音乐与其他艺术形式迥然不同 (2)unlike作形容词，意也为“不同，不像”，相当于different They are both teachers, otherwise they are quite unlike. 他们两位都是教师，除此之外他们迥然不同。 6.harmful adj.有害的，伤害的 常用搭配：be harmful to sb 对……有害 do harm to sb=do sb harm伤害某人，损害某人 Fruit juice can be harmful to children’s teeth. 果汁会对儿童的牙齿有害。 Smoking is harmful to your health.吸烟对你的健康有害。 =Smoking does harm to your health. 【即时练习】 1.The court case will do serious harm_____ my business. A. for B. to C. with D. in 2. The old man was unfortuntely knocked down by a car and badly__. A. damaged B. harmed C. injured D. wounded 7. lay eggs