【正文】 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；擴大 ， 擴張 ① Air expands when heated. 空氣受熱膨脹 。 ” ——“ 祝賀你們 。 substance 是具體的 “ 物質(zhì) ” ，為可數(shù)名詞。 ；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 。 contract“ 收縮 ” ， 符合題意 。 electric 表示 “ 由電產(chǎn)生的 ” 或 “ 帶電的 ” 。 ② The heavy freighter is driven by electric motor. 這輛重型運輸汽車是由電動機驅(qū)動的 。 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 。 ③ The students reacted ________ the social system. 學(xué)生們反對這種社會制度 。 ② The picture is round in shape. 這幅畫是圓形的 。 from“ 形成 ” ， from the habit of doing sth.“ 形成做某事的習(xí)慣 ” ， 符合題意 。 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 。re very ordinary people really—there39。 ② Rabbits and foxes are mon in Britain. 兔子和狐貍在英國很常見 。 mon 指為許多人或事物所共同具備因而常見。 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 。 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 。d like to see how he can ________ a better idea. 答案： ① thinking of ② think about ③ think of ④ Think over ⑤ think up 2． add v． 增加 ， 添加 ① Add some oil to the water. 往水里加些油 。 助記 即學(xué)即用 選詞填空 (add/add up/add to/add...to...) ① He wrote down the weight of each stone and then ________ all the weights. ② I39。 請收拾一下 。 請把它們按順序排列好 。 － thirds of the earth39。 分母若是 “ 2”和 “ 4”， 分別用 half和quarter代替 。 Two－ fifths of the grain ________(be) used to feed animals. ② 百分之九十的吸煙者是男性 。 ① It is my duty to care for the patient. 照料那位病人是我的職責(zé) 。s no use crying over spilt milk. 覆水難收 。s no good ________ (go) there now. 我認(rèn)為現(xiàn)在去那里沒有好處 。 It is getting colder and colder. 天氣越來越冷了 。s” may be a ________ (縮寫 )of “he is” or “he has”． 2． The wood is coated with a ________ (物質(zhì) )that protects it from the sun. 3． Turn off the ________ (電 ) before you try any repairs. 4． Her ________ (結(jié)論 )was that the situation would never bee better. 5． Workers ________ (反應(yīng) ) angrily to the latest news of more job losses at the factory. 6． A puter is the most important piece of ________ (設(shè)備 ) you will buy. 7． The road was ________ (部分地 )blocked by a fallen tree. 8． He lives in an ________ (普通的 ) house in the small town. 9． Salt ________ (溶解 )in 。 mixed 句意為：每個學(xué)生都把一根手指放在老師剛才調(diào)好的混合物中蘸了蘸并嘗了嘗 。 3 ． —What39。 4． —How did he react ________ the punishment that they gave him for the shoplifting? —He was very angry. 答案： to “ 對 ?? 作出反應(yīng) ” 用 react to...。 ordinary 本題考查以下詞的用法：mon“ 普遍的；常見的 ” ； ordinary“ 普通的；不特殊的 ” ， 其反義詞為 special。 add 本題考查 as引導(dǎo)非限制性定語從句 ， 及固定搭配 “ add...to...”。 10． —Why not join us? —I can not. ________I would rather not.