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1、Unit 4,Reading,Moving to Mars,1. It is hoped that people could start all over again and build a better world on Mars. 人们有望能够在火星上重新开始，建设一个更好的世界。,all over again表示“再，重新”,Each time you fail, start all over again.,Language points,eg:每次你失败了，就要重新再来。,2. At present, our spacecraft are too slow to carry large
2、 numbers of passengers to Mars. 目前，我们的宇宙飞船太慢了，无法运送大批的乘客去火星。,large numbers of 表示“大量的” = a large number of,Large numbers of people go travelling during the National Day.,eg:很多人在国庆期间旅游。,3. With the development of technology, by the year 2100, the journey might only take about 20 minutes in spacecraft t
3、hat travel at the speed of light! 随着技术的发展，到2100年，乘坐以光速飞行的宇宙飞船，行程或许只要大约20分钟！,I was second in the race with a time of 14.2 seconds.,介词with短语，在句中常用作状语，表示原因、条件、时间、伴随、方式等。,eg:我以14.2秒的成绩在比赛中位列第二。,By the time I got to the station the train had already gone.,by 表示“到为止，截止 ”,eg:等我到达火车站时，火车已经开走了。,at a/the spee
4、d of 表示“以的速度”,The car is moving at a speed of 100 kilometres per hour.,eg:小汽车正以每小时100公里的速度行驶。,4. People would have to wear boots . to prevent themselves from floating off into space.,prevent.from.(from可省略) =stop.from.(from可省略) =keepfrom.(from不可省略) 三者都表示“阻止，预防某人干某事”。,He was prevented from going to sc
5、hool because of illness.,人们将必须穿着特别定制的靴子以免飘进太空。,eg:因为生病，他被阻止进入学校。,Ato live Bfrom living Cliving Don living,选择题。 We must prevent pollution _ happily,practice,注意：prevent sb. from doing sth.这一句型中的sb.与其后的doing sth.通常有逻辑上的主谓关系，而这里to live happily为目的状语，故选A.,5. The gravity on Mars is only about three-eighths
6、 of that on the Earth. 火星上的重力大约只有地球上的八分之三。,The air on Mars is much thinner than that on the Earth.,在做比较时，我们常用that/those指代句中类似或相同的那一部分。此句中that指代前面的gravity。,eg:火星上的空气要比地球上的空气稀薄得 多。,three-eighths 八分之三 分数在英语中通常是借助于基数词和序数词来共同表达的。其中基数词表示分子，序数词表示分母。如： one-tenth 十分之一 a third 三分之一 注意：“几分之一”分子除用one外，也 可用a。,tw
7、o thirds 三分之二 four fifths 五分之四 但是，1/2不能说a (one) second, 而要说 a (one) half。1/4和3/4可以说 a (one) fourth 和 three fourths, 但常用a quarter 和 three quarters表示。,如果分子大于1， 分母要用复数形式。如：,选择题。 About _ of the students are from foreign countries. (2011山东东营) A. three four B. three fourth C. third fourth D. three fourths
8、 翻译句子。 我们班五分之三是女生。 _ the students in my class _ girls.,practice,Three-fifths of,are,6. Compared with life on the Earth, life on Mars would be better in some ways. 与地球上的生活相比，火星上的生活在 有些方面要好些。,Children seem to learn more interesting things compared to/with when we were at school.,compared with 表示“与相比”
9、此句中的 “compared with the life on the Earth” 为 v-ed短语作状语。,eg:与我们上学时相比，孩子现在学到的有趣东西似乎更多一些。,用compare with 和 compare to 的正确形式填空。 He cannot _ Shakespeare as a writer of tragedies. 2. You cannot _ this war _ the Vietnam war (越南战争).,practice,compare with,compare to,compare . to 意为“把比作”,拓展：,eg:莎士比亚把人世比作舞台。,Sh
10、akespeare compared the world to a stage.,7. Life on Mars would be interesting as well as challenging. 火星上的生活，不仅有挑战性，还很有趣。,I want to visit Andrew as well as Martin.,as well as 意思为“不但而且”,eg:我想去拜访安德鲁，还有马丁。,She shares (in) my troubles as well as my joys.,她与我同甘共苦。,阅读小短文，判断对错并改正。,True or false. 1. There w
11、as liquid water on Mars long ago. 2. The writer is sure that there is life on Mars. 3. Mars has everything needed for life. 4. It is easy for men to stay on Mars.,T,F,F,F,not sure whether,does not have,not easy,Homework,1.To make a list of the things that an astronaut uses 2. Learn all the words in this class by heart.,
