Unit 4 Astronomy the science of the starsⅠ.重点单词聚焦1．It cost him more than one________(十亿) dollars to complete the project.答案： billion2．“What happened？” John’s mother asked him in a________(温和的) voice.答案： gentle3．Before the Earth’s protective________(大气层) was formed，there was no life except in the sea.答案： atmosphere4．With the________(引力) of the moon and the sun each day，tides (潮汐) roll in and roll away.答案： pull5．Manmade________(卫星) are used for sending and receiving messages.答案： satellites6 ． Smoking________( 乘 ， 增 加 ) the risk of heart attacks and other health problems.答案： multiplies7．Eating too many desserts can be________(有害的) to one’s teeth.答案： harmful8．Global warming and________(气候) change problems are perhaps the greatest threats to our planet.答案： climate9．According to the________(理论) of relativity (相对论)，nothing can travel faster than light.答案： theory10．Most of the evidence had been destroyed.________(因此，于是)，it was almost impossible to prove him guilty.答案： ThusⅡ.重点短语扫描1．prevent... ... 阻止……2． eggs 下蛋3． one’s turn 轮到某人；接着用心 爱心 专心14．get the hang 熟悉；掌握；理解5．watch 密切注视；当心；提防6．depend 依靠7． time 及时，终于8．give 产生；分娩9．cheer 感到高兴；感到振奋10．now 既然11．break 突发；爆发fromlayinofoutoninbirth toupthatoutⅢ.课文原句突破1．随后它会变成什么没有人知道，直到 38～45 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 settled 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；...
