Unit 1 Interesting stories about animals——Understanding of grams, kilograms and tons 动物趣闻——克、千克、吨的认识 The smallest bird in the world is the hummingbird, which hatches to less than a gram! 世界上最小的鸟是蜂鸟，孵出来时还不到1克呢！ The smallest dog in the world weighs about one kilogram. 世界上最小的狗大约重1千克。 The largest kangaroo weighs about 90 kilograms. 最大的袋鼠大约重90千克。 A blue whale caught in the Atlantic Ocean in 1912 weighed about 150 tons, and its kidneys weighed about a ton. 1912年在大西洋捕到的一条蓝鲸大约重150吨，它的肾大约重1吨。 What questions can you ask? 你能提出什么问题？ Cooperative exploration 合作探索 1. How much does 1 gram weigh? 2. 1克有多重？ One piece of gum weighs 3 grams. I think 1 gram is very light. 1片口香糖重3克。我想1克很轻。 A measure of the weight of a light object, usually in grams, denoted by the sign“g” . We often weigh lighter articles on a scale. 计量较轻物品有多重，通常用克作单位，克用符号g表示。我们常用天平称比较轻的物品。 The following figure shows the weights for the balance. Each weight is marked with grams. 下图是天平用的砝码，每个砝码上标有克数。 200g: two hundred grams 100g: one hundred grams 50g: fifty grams 20g” twenty grams 10g :ten grams 5g: five grams 2g: two grams 1g: one gram. 2.How much does 1 kilos weigh? 1. 1千克有多重？ A bag of washing powder weighs one kilogram. 1袋洗衣粉重1千克。 Two bags of salt (500g) weigh 1kg. 2袋盐(500g)重1千克。 To measure the weight of a heavier object, usually in kilograms, which is expressed by the symbol KG. The kilogram is also called a kilogram. 计量较重物品有多重，通常用千克作单位，千克用符号kg表示。千克又叫公斤。 1 kilogram is equal to 1000 grams 1千克＝1000克 Do you know how much these items weigh? 你知道下面这些物品有多重吗？ This cabbage weighs 2 kilograms. 这颗白菜重2千克。 These bananas weigh three kilos. 这些香蕉重3千克。 My weight is 25 kilos. 我的体重是25千克。 3.How much does a ton weigh? 3.1吨有多重？ The weight of a heavy article or commodity, usually in tons, indicated by the symbol “t”. 计量很重的物品或大宗物品有多重，通常用吨作单位，吨用符号t 表示。 1 bag of rice (10kg) weighs 10kg, 10 bags of rice weighs 100kg, and 100 bags of rice weighs 1000kg. One thousand kilograms makes one ton. 1袋大米(10kg)重10千克，10袋大米重100千克，100袋大米重1000千克。1000千克就是1吨。 1 ton is equal to 1000 kilograms 1吨 ＝1000千克 A girl weighs about 25 kilograms, 1个女孩的体重大约是25千克， Four girls weigh about 100 kilograms, 4个女孩的体重大约是100千克， Forty girls weigh about a ton. 40个女孩的体重大约是1吨。 |
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