【正文】 us in the experiment of “Iron in ordinary water”？ A． Oil. B． Cotton. C． Bunsen burner D． Test tube holder. 3． The purpose of these two experiments is ________. A． to find out how iron reacts with water and air B． to find out how important iron is C． to find out how to do the experiment of iron39。t react with water. When we calcium in oxygen, it burns to an oxide. In the second part of the experiment, you must boil the water to make sure there is no air in it. You add some oil to the water because this air out of it. It also shows that iron does not rust in water without air in it. ， the nails rust in the tube with ordinary water in the third part of the experiment. That is how iron reacts with air and with water. 答案： Step 1 Step 2 Ⅰ . Ⅱ . Step 3 課內(nèi)合作探究 v. 膨脹；擴(kuò)大 ， 擴(kuò)張 ① Air expands when heated. 空氣受熱膨脹 。 ③ His pany expanded into a big one. 他的公司擴(kuò)大規(guī)模而成為了大公司 。 ” ——“ 祝賀你們 。 2． substance n. [C] 物質(zhì) This is a chemical substance. 這是一種化學(xué)物質(zhì) 。 substance 是具體的 “ 物質(zhì) ” ，為可數(shù)名詞。 即學(xué)即用 單詞拼寫 Heroin is an illegal s________. 海洛因是一種違禁品 。 ；簽署 n． [C]合同 ① The tunnel contracts to a narrow passageway as you go deeper. 再往深處走 ， 隧道縮小成了一條窄窄的通道 。t make a contract until you have studied provisions carefully. 你應(yīng)該先仔細(xì)研究合同的條款 ， 然后再簽訂 。 contract“ 收縮 ” ， 符合題意 。 辨析： electrical, electric electrical 表示與電 (學(xué) )方面有關(guān)的，指 “ 電的，電氣的 ” 。 electric 表示 “ 由電產(chǎn)生的 ” 或 “ 帶電的 ” 。 ① The cooker isn39。 ② The heavy freighter is driven by electric motor. 這輛重型運(yùn)輸汽車是由電動機(jī)驅(qū)動的 。 electrical“ 電的；與電有關(guān)的 ” ， 符合題意 。 拓展 react with 與 ?? 發(fā)生化學(xué)反應(yīng) react to sb./ /某物作出反應(yīng) react against sb./sth. 反對 ， 反抗某人 /某物 react on/upon sb./ /某事物有影響 ② How did they react to your suggestion? 他們對你的建議有什么反應(yīng) ？ ③ Children tend to react against their parents by going against their wishes. 孩子們傾向于違背父母的愿望來反抗父母 。 即學(xué)即用 用適當(dāng)?shù)慕樵~填空 ① Many chemical substances react ________ oxygen. 許多化學(xué)物質(zhì)都與氧氣發(fā)生反應(yīng) 。 ③ The students reacted ________ the social system. 學(xué)生們反對這種社會制度 。 ② Seven players form the team. 7名運(yùn)動員組成了這支隊(duì)伍 。 ② The picture is round in shape. 這幅畫是圓形的 。 shape 強(qiáng)調(diào)物體具體的外形，如心臟的形狀、 V字形等。 from“ 形成 ” ， from the habit of doing sth.“ 形成做某事的習(xí)慣 ” ， 符合題意 。d sound a lot more polite if you make a request ______the form of a question. 答案： in 題意：如果你以問句的形式提出請求聽上去會更禮貌 。 7． aim n. [C]目標(biāo) ， 目的； [U]瞄準(zhǔn) v. 努力；力爭；瞄準(zhǔn) ① What is your aim in life? 你的生活目標(biāo)是什么 ？ 拓展 (1)with the aim of 為了 ?? (2)aim v． 對準(zhǔn)目標(biāo) ， 打算 aim at sth./doing sth. 瞄準(zhǔn)；針對 aim to do sth. 旨在做某事 ， 打算做某事 ② He aims to be a successful writer. 他的目標(biāo)是成為一名成功的作家 。 ④ My remarks were not aimed at you. 我的話不是針對你的 。re very ordinary people really—there39。 ② What is ordinary in one country may be strange in another. 在一個(gè)國家很平常的事 ， 在另一個(gè)國家可能很新奇 。 ② Rabbits and foxes are mon in Britain. 兔子和狐貍在英國很常見 。ll meet at the usual time. 我們將在老時(shí)間見面 。 mon 指為許多人或事物所共同具備因而常見。 即學(xué)即用 完成句子 —What is the novel about? —It describes the way of life of the ________ people there. 答案： ordinary 題意： ——“ 這本小說是關(guān)于什么的 ？ ” ——“ 它描述了那里的普通人的生活方式 。 9． conclusion n. [C]結(jié)論； [常 sing.]結(jié)束 ① His conclusion is that the peace is possible. 他的結(jié)論是：和平是可能的 。d like to say how much I have enjoyed myself today. 最后 ， 我想說我今天玩得非常開心 。 即學(xué)即用 語法填空 ________conclusion, I would like to say how much I have enjoyed myself today. 答案： In 題意：最后 ， 我想說今天我很開心 。 of(＝ think about)考慮；構(gòu)思出 ， 想出 ① She is thinking of changing her job. 她正考慮著換工作 。d like to see how he can ________ a better idea. 答案： ① thinking of ② thin