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1、Unit 4Astronomy the science of the stars.重点单词聚焦1It cost him more than one_(十亿) dollars to complete the project.答案：billion2“What happened？” Johns mother asked him in a_(温和的) voice.答案：gentle3Before the Earths protective_(大气层) was formed，there was no life except in the sea.答案：atmosphere4With the_(引力) o
2、f the moon and the sun each day，tides (潮汐) roll in and roll away.答案：pull5Manmade_(卫星) are used for sending and receiving messages.答案：satellites6Smoking_(乘，增加) the risk of heart attacks and other health problems.答案：multiplies7Eating too many desserts can be_(有害的) to ones teeth.答案：harmful8Global warmi
3、ng and_(气候) change problems are perhaps the greatest threats to our planet.答案：climate9According to the_(理论) of relativity (相对论)，nothing can travel faster than light.答案：theory10Most of the evidence had been destroyed._(因此，于是)，it was almost impossible to prove him guilty.答案：Thus.重点短语扫描1prevent. .阻止2 e
4、ggs下蛋3 ones turn轮到某人；接着4get the hang 熟悉；掌握；理解5watch 密切注视；当心；提防6depend 依靠7 time及时，终于8give 产生；分娩9cheer 感到高兴；感到振奋10now 既然11break 突发；爆发fromlayinofoutoninbirth toupthatout.课文原句突破1随后它会变成什么没有人知道，直到3845亿年前，这团尘埃才慢慢地形成一个固体的球状物。_ _ _ _ _was uncertain until between 4.5 and 3.8 billion years ago when the dust se
5、ttled into a solid globe.答案：What it was to become 2地球变得如此猛烈，以至于它的形状能否持久还不清楚。The earth became_violent_it was not clear whether the shape would last or not.答案：so；that3这就产生了一系列的反应，使得生命就有可能开始发展了。This produced a chain reaction，which_ _ _ _ _ _ _.答案：made it possible for life to develop4而当我试着向前迈步的时候，我发觉我被送
6、出去很远，步子的跨度竟是在地球上的两倍，因而我摔倒了。But when I tried to step forward，I found I was carried_ _ _ _ on the earth and fell over.答案： twice as far as5“天哪，”我大声说。“引力改变了，走路也的确需要练一练了。”“Oh，dear，” I cried，“walking does need a bit of practice_ _gravity has changed.”答案：now thatatmosphere n大气层，空气；环境，气氛教材原句P25：They were in
7、 time to produce carbon，nitrogen，water vapour and other gases，which were to make the earths atmosphere.它们最终产生了碳、氮气、水蒸气和其他气体，这些后来形成了地球的大气层。The waste they create goes into the atmosphere and makes us sick.它们制造出来的废气进入大气中，导致我们生病。The simple atmosphere of the office calmed me.简朴的办公室气氛让我平静下来。Ever since the
8、ir quarrel，there has been an unpleasant atmosphere in the office.自从他们发生口角以来，办公室里总有一种不愉快的气氛。1.(湖北高考)The top leaders of the two countries are holding talks in a friendly_.AatmosphereBstateCsituationDphenomenon解析：句意为：两国高层领导人之间的会谈在友好的气氛中举行。atmosphere气氛；state状态；situation处境；phenomenon现象。由句意可知A项正确。答案：Aharm
9、ful adj.有害的，其反义词为harmless教材原句P26：What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas.很多科学家相信，由于地球上长期有水存在，它使得地球得以把曾经存在于大气层中的有害气体和酸性物质溶解在海洋里。be harmful to对有害do harm to./do.harm损害There is no harm in doing st
10、h./It does no harm to do sth.做某事是个好主意(或没有坏处)It is harmful to your health to drink too much.过量喝酒对你的身体有害。Your smoking can be harmful to the health of your children.你吸烟会危及孩子的健康。He would never frighten anyone or cause them any harm.他永远不会吓唬或伤害任何人。He may say no，but theres no harm in asking.他可能拒绝，但问一问也无妨。2
11、.Doctors always tell us that drinking too much_our health，but some people dont care.Ais harm toBdoes harmful toCis harmful toDdo harm to解析：句意为：医生总是告诉我们饮酒太多有害健康，但有些人却不在意。be harmful to sb.do harm to sb.对某人有害。D项应用第三人称单数。答案：Cpuzzle vt.使迷惑；使为难；使窘困；感到迷惑；n.(游戏的)猜谜；难题；谜教材原句P27：How life began on earth is one
12、 of the biggest puzzles that scientists found hard to solve.地球生命如何起源是科学家们觉得很难解决的最大的难题之一。What puzzles me is why he left the country without telling anyone.令我百思不解的是他为什么悄悄地离开了这个国家。I have been puzzling about this question for weeks now.我对这个问题已冥思苦想了好几个星期。Its quite a puzzle to us why he did that.他为何做这样的事，
13、我们完全搞不懂。Her puzzled look on her face suggested she didnt understand what I said.她脸上迷惑的表情表明她不明白我说的话。3.完成句子She lost heart since she failed in the exam.She_(对将来感到迷茫)答案：felt puzzled about her futurepull n& vt.拉(力)；拖；牵引力教材原句P30：As the rocket rose into the air，we were pushed back into our seats because we
14、 were trying to escape the pull of the earths gravity.随着火箭的升空，我们被重重地推回到座位上，因为我们正尽力摆脱地球的引力。pull back撤回pull down拆毁；摧毁pull in(车辆)进站停靠；靠边停靠pull out驶出；退出pull through康复；痊愈He pulled the door open and rushed out.他拉开门，冲了出去。The police car signalled to us to pull in.警车发出信号，要我们驶向路边停靠。We waved as the train pulled out of the station.火车驶出车站时我们挥手告别。The doctor told me that I would pull through.医生告诉我我会康复的。4.用pull的短语填空：(1)H
