知识梳理 点滴知识 1. If we don’t do something now, they may all disappear forever! 【解析】这句话中包含了一个由if引导的条件状语从句。当主句谈论将来发生的事情时，if引导的条件状语从句谓语动词用一般现在时，主句谓语动词用一般将来时或情态动词may/can/must等。例如： If the rain stops, we will go outside to play football. 如果雨停了，我们就出去踢足球。 If we don’t go to the park, I may go to the library. 如果我们不去公园，我可能去图书馆。 2. One problem is that their homes are disappearing. 【解析】这句话中包含了一个由that引导的表语从句。表语从句是用一个完整句子充当表语成分，表明主语的身份、特征或其他内容。其结构为：主语＋系动词＋引导词＋表语从句。例如： The problem is that we don’t have much money. 问题是我们没有多少钱。 悦读阅读 Dolphins Dolphins(海豚) are small whales and they live in the sea. They may look like fish, but they are not. They are mammals(哺乳动物) like us. An adult dolphin is usually about 3 to 4.2 metres long and weighs(称重) up to 450 kg. Dolphins are good swimmers. They can swim at 50 kilometres an hour. They move their big tails up and down when they swim. The slim face of a dolphin makes it the most popular animal. These friendly animals usually make their homes near land. Sometimes they will swim to people. They enjoy playing with people. And people enjoy swimming with them, too. 阅读短文，判断正(T)误(F)。 ( )1. Dolphins are good at jumping.[来 ( )2. An adult dolphin weighs up to 450 kg. ( )3. Dolphins don’t like to play with people. ( )4. Dolphins can swim at 50 metres an hour.[来 ( )5. The Chinese meaning of popular is “受欢迎的”. Key: 1. F 2. T 3. F 4. F 5. T 说词解语 be made from/of 不一样 小朋友，今天我们一起来学习“be made from”和“be made of”的不同吧！ 句型 释义 辨析 例句 be made from 用……制成 成品看不出原材料 The medicine is made from animals. 这种药是用动物制成的。 be made of 用……制成 成品能看得出原材料 The table is made of wood. 这张桌子是用木头制成的。[来 愿你多知 动物对地球和人类的贡献(一) 大小不一、形态各异的动物，共同存在于地球上。同时，它们也各司天职，为维护地球的平衡作出了贡献。我们一起来看看吧！ 蚂蚁(ant)让土地通气，它还能掘出管道，让水可以流向植物。 蝙蝠(bat)传播种子；它们的粪便为土壤施肥；科研人员从它们的回音定位法中得到启发，为视障人士发明了助行拐杖。 水獭(beaver)建筑堤坝，保护湿地。 蜜蜂(bee)为庄稼、果树和各种花朵授粉。 鸟类(bird)传播种子，为植物授粉。 狗(dog)陪伴视障者和听障者。它们在给他们带路的同时，也是给他们带来心理安慰的伙伴。 海豚(dolphin)是具有治疗和拯救作用的动物；它们也能帮助人类寻找海洋矿藏。 ... ...
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