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1、Unit 4 Topic 3 What do you know about Mars 【学习目标】了解更多关于火星的知识。【预习案】一、读1a的内容，完成1b 二 、在文中找到并划出下面的短语41.be named after Mars_ 2.the Roman god of war_ 3.53% as wide as_ 4.相隔_ 5.覆盖火星的整个表面_ 6.仅仅36公斤重_7.和的2/5一样重 _8.彼此距离最近 _9.搜寻更多信息 _ _10.a useful place to dry fruit_ 11.a good place for human beings to live_ _
2、 12.a comfortable place for heavy people_ 13.水的供应_14.限制水的使用_ 15.思念家人_ 【探究案】 在文中划出下面的句子并分析1 Its diameter is 53 as wide as that of the earth. 译：_ 点拨：as形容词/副词原级as 名词 - 像一样 思考：句中that指代_, 如果前面的名词是复数，用_指代 练习：a.我们学校像花园一样美。Our school is _ _ _ a park.b.Tom和Mike跑得一样快。Tom _ _ _ _ Mike.c.美国的人口没有中国多。The populati
3、on in America _ _ _ _ in China.d.城市的楼比农村的高。The buildings in the city _ _than _ in the country.2.Mars goes around the sun at a distance of about 228 million kilometers. 译：_ 点拨: at a distance of -相隔 拓展：at/from a distance - 在远处 练习：a. Put the stone at a distance of about twenty meters here. 译：_b. The po
4、lice followed him at a distance. 译：_3.The gravity on the surface of Mars is about two-fifths as strong as it is on earth. 译：_点拨：倍数词/分数/百分数as 形容词或副词原级as - 是的几倍/几分之几/百分之几 练习：a.这个盒子是那个盒子的四倍重。 This box is _ _ _ _ _ that box. b.这个房间是那个房间的三分之一大。This room is _ _ _ _ _ that room.4.So a person who weighs 90
5、kilos on earth weighs only 36 kilos on Mars. 译：_点拨：a person who weighs 90 kilos on earth - 一个重达90公斤的人 思考：句中第一个weighs是_句的_; 第二个weighs是_句的_5.It takes a spaceship about eight months to reach Mars from the earth when the two planets are closest to each other.译：_同义句：A spaceship _ _ _ _ _ Mars from the ea
6、rth when 点拨：be closest to- 离最近 拓展：离近_;离远_6.Scientists are still searching for more information about Mars. 译：_ 点拨：search - 搜寻，搜索，搜查(动词) 拓展：search sb. / sth - 搜某人的身/搜某物 search for sb. / sth.- 搜寻某人/某物 练习: a. Simon searched his mind but he couldnt come up with the answer. 译：_ b.警方在寻找失踪的孩子。The _ are _ _
7、 the _ child.c.消防员在建筑物中搜寻幸存者。Firefighters were _ the building _ survivors.7.Scientists think that there has been life on earth for millions of years. 译：_思考：There has been是There be结构的_时态拓展：There be结构的过去时态是_; There be结构的将来时态是_或_ 此外还有：可能有_; 一定有_; 过去经常有_ 8.It has been two days since we landed on Mars. 同
8、义句：It _two days _ we landed on Mars.练习：a.自我们上次上街购物已经是两个月了。It _ _ two months _we _ shopping. b.他父亲死了十年了。It _ ten years _ his father _. 同义句：a. His father _ ten years _. b. His father _ _ _ for ten years.9.Generally, the journey went well, but the living conditions were quite bad during the journey.点拨：
9、go well - 进展顺利 译：_ 练习：a.Do these colors go well together. 译：_b.Things didnt go well for us at first, but everything is fine now. 译：_c.Fish doesnt go well with mutton. 译：_ d.一切进展顺利。译：_10.We had to limit the use of water during those days. 译：_点拨：limit - 限制(动词) the use of - 的使用 注意：use在此是名词链接：use -_( ) useful-_( ) useless-_( ) reuse-_( ) user-_( )11.Whats worse, our water supplies were very low. 译：_点拨：supply -供给(名词) 链接：supply -供应(动词) - supply sth. for sb.= supply sb. with sth.-给某人供应某物12.I often miss the family, but the excitement o
