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1、Unit 4Astronomy：the science of the stars.常考单词必背1harmful adj.有害的Its harmful to your eyes to read books in the bus.在公共汽车上看书对你的眼睛有害。快速闪记(1)be harmful to.对有害(2)harmless adj.无害的harm n损害；伤害 v对有害；伤害；损害2exist vi.存在；生存Nothing exists on the moon as there is no water and no air.月球上没有东西生存，因为那里没有水和空气。快速闪记(1)exis
2、t in存在于exist on靠生存There exist(s)/existed.某地有/存在(2)existence n存在；生存3puzzle n谜；难题vt.& vi.(使)迷惑；(使)为难The puzzled look on her face suggested she was puzzling over the puzzling math problem.她困惑的表情暗示了她正在思考那个令人困惑的数学问题。快速闪记(1)be in a puzzle感到困惑；不知如何是好puzzle about/over冥思苦想；苦苦思索(2)puzzling adj.令人迷惑的puzzled ad
3、j.感到迷惑的4pull n& vt.拉(力)；拖；牵引力She pulled his sleeve to get his attention.她拉拉他的袖子以引起他的注意。快速闪记pull down摧毁、推翻、拆除pull in进站停靠；驶向路边(或某处)停靠pull out离站；(使)摆脱困境pull through恢复健康；渡过危机5mass n质量；团；块；大量；(复)群众 I have masses of work to do.我有大量工作要做。.高频短语必会1in time 及时；终于Lucky for him，he was just in time for the bus.幸运的
4、是，他及时赶上了公共汽车。快速闪记on time准时；按时at a time一次；每次at one time曾经；一度；同时at times有时；偶尔at no time决不in no time马上；立刻2give birth to 产生；分娩To our great joy，my sisterinlaw gave birth to a baby boy.使我们大为高兴的是，我嫂子生了个男孩。快速闪记at birth出生时by birth天生地；生来；在血统上3in ones turn 轮到某人；接着When it was in my turn，I was too excited to spe
5、ak.当轮到我时，我激动地都说不出话来了。快速闪记in turn 依次；轮流；因此；因而by turns 轮流；依次take turns to do sth/in doing sth 轮流做某事It is sb s turn to do sth 轮到某人做某事4prevent.(from) 阻止；制止No one can prevent me(from) going there.没有人能够阻止我去那儿。快速闪记(1)protect.from/against.保护不受侵袭(2)同义词：stop.(from) doing.；keep.from doing.5cheer up 感到高兴；感到振奋I
6、wrote that song just to cheer myself up.我写那首歌只是为了让自己高兴。快速闪记cheer sb on为某人加油6now that 既然Now that everyone is here，lets begin our meeting.既然大家都到齐了，我们就开始开会吧。快速闪记引导原因状语从句的连词：now that，since，because，as，considering (that)，in that等。7break out 突发；爆发Something unexpected always breaks out in this area.在这一地区总有意
7、想不到的事情发生。快速闪记break up解散；打碎break away from.脱离break down打破；坍塌；(精神、身体)垮掉break in进入；插话break into强行进入(某处)；突然开始(大笑、欢呼等)8watch out 密切注视；当心；提防You should watch out for John，who often makes fun of others.你应该提防约翰，他经常取笑别人。快速闪记watch over照看；看守look out注意，当心take care注意，当心be careful注意，当心.写作句式必学1The earth became so v
8、iolent that it was not clear whether the shape would last or not.地球(开始)变得激烈动荡，不知道这个固体形状是否会继续存在下去。2What is even more important is that as the earth cooled down，water began to appear on its surface.更为重要的是当地球平静下来时，水开始在地球表面出现了。3This produced a chain reaction，which made it possible for life to develop.这就
9、产生了一个连锁反应，使生命的发展成为可能。4So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.所以，在未来的数百万年中，生命能否在地球上延续取决于这个问题能否得到解决。5It was not immediately obvious that water was to be fundamental to the development of life.水对于生命的发展会起到关键作用这一点并没有立即明朗化
10、。6But when I tried to step forward，I found I was carried twice as far as on the earth and fell over.而当我试着向前迈步的时候，我发觉我被送出去很远，步子的跨度竟是在地球上的两倍，因而我摔倒了。短文语法填空，然后背诵短文，熟记本单元的重点词汇。Explore MKIIMKII，a planet_1_(billion) of kilometers away，is the origin of life in many religions.Physicists have proved the theor
11、y _2_ its gentle climate and the pull of its gravity are similar to _3_ earths.And astronomers have found that oxygen atoms and carbon dioxide，which are fundamental to life，exist in its atmosphere through satellites._4_(cheer) up by this news，biologists，in their turn，began to do some research to rem
12、ove peoples puzzlesNow that there are some suitable conditions，does life really exist on this globe? Do they multiply by laying eggs or giving birth _5_ babies?Last month，a spaceship _6_(send) there.Its a pity that this mission failed.Unlike the earth，MKII is a much _7_(young) planet.Thus，masses of
13、_8_(harm) acid clouds float everywhere causing violent chain reactions to break out.These clouds not only _9_(block) out the pilots sight but also damaged the engine system.Luckily，the pilots watched out carefully and prevented the spaceship from _10_(crash) in time.答案1.billions2.that3.the4.Cheered5.to 6was sent7.younger8.harmful9.blocked 10crashing4
