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﹢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.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. 火星在相距大约两亿两千八百万千米的地方绕着太阳旋转。第 1 页
Unit4 Topic2 SectionC 精品学案一、预习热身。翻译：A:be named after Mars_____________________ at a distance of...______________________53% as wide as...____________________ two-fifths as strong as...____________________be closest to each other____________________ search for more information_________________B:On the surface of Mars__________________ weight only 36 kilos____________________ the Roman god of war____ C:Its diameter is 53％ as wide as that of the earth.. _______________________________________It has been two days since we landed on Mars._________________________________________二、重难点释疑。1. Its diameter is 53％ as wide as that of the earth.. 它的直径是地球直径的53％。点拨：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 kilos on earth weighs only 36 kilos on Mars. 因此，一个在地球上重90千克的人在火星上只有36千克的重量。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 twoplanets are closest to each other.在地球与火星最接近的时候，宇宙飞船需要用大约8个月的时间才能从地球到达火星。同义句：A spaceship _________ ______ ________ ________ _________ Mars fromthe earth 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. 科学家们仍然在搜索更多有关火星的信息。 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:消防员在建筑物中搜寻幸存者。Firefighters were ________ the building_________ survivors.7.It has been two days since we landed on Mars. 我们登上火星已经两天了.同义句：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 ________. 第 2 页
点拨: at a distance of 相隔… 。拓展：at/from a distance 在远处 。3.The gravity on the surface of Mars is about two-fifths as strong as it is on earth. 火星表面的引力大约是地球表面引力的五分之二。点拨：倍数词/分数/百分数﹢as
b. His father _____ ______ ______ for ten years.8.What’s worse, our water supplies were very low. 更糟糕的是，我们的水供给是非常少。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.9.I often miss the family, but the excitement of being on Mars is worth it. 虽然我经常思念家人，但火星探险的兴奋和冒险还是值得的。点拨：be worth sth. 值… ,链接： be worth doing sth. 某事值得做。练习：这事值得我们付出劳动。It _______ _______ our work..这本书值得一读。The book ________ __________ ___________第 3 页
Unit4 Topic2 SectionC 精品学案一、预习热身。翻译：A:be named after Mars_____________________ at a distance of...______________________53% as wide as...____________________ two-fifths as strong as...____________________be closest to each other____________________ search for more information_________________B:On the surface of Mars__________________ weight only 36 kilos____________________ the Roman god of war____ C:Its diameter is 53％ as wide as that of the earth.. _______________________________________It has been two days since we landed on Mars._________________________________________二、重难点释疑。1. Its diameter is 53％ as wide as that of the earth.. 它的直径是地球直径的53％。点拨：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 kilos on earth weighs only 36 kilos on Mars. 因此，一个在地球上重90千克的人在火星上只有36千克的重量。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 twoplanets are closest to each other.在地球与火星最接近的时候，宇宙飞船需要用大约8个月的时间才能从地球到达火星。同义句：A spaceship _________ ______ ________ ________ _________ Mars fromthe earth 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. 科学家们仍然在搜索更多有关火星的信息。 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:消防员在建筑物中搜寻幸存者。Firefighters were ________ the building_________ survivors.7.It has been two days since we landed on Mars. 我们登上火星已经两天了.同义句：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 ________. 第 2 页
点拨: at a distance of 相隔… 。拓展：at/from a distance 在远处 。3.The gravity on the surface of Mars is about two-fifths as strong as it is on earth. 火星表面的引力大约是地球表面引力的五分之二。点拨：倍数词/分数/百分数﹢as
b. His father _____ ______ ______ for ten years.8.What’s worse, our water supplies were very low. 更糟糕的是，我们的水供给是非常少。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.9.I often miss the family, but the excitement of being on Mars is worth it. 虽然我经常思念家人，但火星探险的兴奋和冒险还是值得的。点拨：be worth sth. 值… ,链接： be worth doing sth. 某事值得做。练习：这事值得我们付出劳动。It _______ _______ our work..这本书值得一读。The book ________ __________ ___________第 3 页
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