开心学英语四下unit1hi,tony!hi,jenny(2)内容摘要:
fter the questions and have Ss answer before they listen to the responses. Have Ss write C and D in the corresponding boxes. Practice 2 Getting ready Have Ss look at the sentences on the page. T: A. Repeat. What’s doing? Ss: What’s he doing? Do the same for the other three sentences. Using the book Now look at picture A. What’s he doing? Have one student answer. (( S1: He’s touching his teeth.) Continue with the rest. For C and D, you may need to give some chances by asking some yes/no questions, . Are those fingers? Are those toes? Song activity Getting ready Have Ss look to the pictures around the lyrics.。开心学英语四下unit1hi,tony!hi,jenny(2)
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thinking. Have Ss look for the sentences He’s thinking. On the page. T: Write A in the box. Continue with the rest. Practice 2 Getting ready Have Ss look at the sentences on the page. T: A. Repeat.
2、。 ( ) 1为防止流感病毒的传播,许多公共场所都注意环境消毒,以下消毒药品属于强电解质的是( )答案: 体分别加入到 100 列液体中,溶液的导电能力变化最小的是( )A自来水 B0.5 1 盐酸C0.5 1 液 D0.5 1液解析:溶液混合后导电能力变化的大小,关键看混合后溶液中自由移动离子的浓度的变化。 由于自来水几乎不导电,加入 ,导电性突然增大;醋酸是弱电解质,加入 ,生成强电解质
2、的复分解反应都不属于氧化还原反应。 ()(8)氧化剂得电子,被还原,得到氧化产物。 () 1由于环保方面的原因,目前要推广使用以水为溶剂的防锈漆水基防锈漆,但水基漆较易溶解 干燥之前易导致金属表面产生锈斑,为此要在水基漆中加入缓蚀剂,以下可作为缓蚀剂添加的是( )A BC D解析:缓蚀剂必须具有还原性,根据中心元素的化合价分析,只有 案:列实验中
睡觉、买东西、游泳 …… ) Gogo: What are you doing? What is he/she doing? Step5. Open the book at P43, listen and look at Conversation. (老师指着 Picture 4) T: What are they doing? S: They are shopping.
oto 和 ork邀请 4 个学生上台,要求他们在字母之间连线,并说出单词。 P42,完成练习 4。 T: Look at the letters and match them. Then match the words to their pictures. Check the answers. 让学生正确读出单词。 重点突出 [s] [f] [w]的读音,使学生掌握这些音标发音。
2、( )(8) 原性强,所以 比 氧化性强。 ( ) 1在氧化还原反应中,下列各组物质均可用作氧化剂的是()AF 、I 、S 2 B 、4 3CD、 、4解析:F 、I 、S 2 只能作还原剂,A 项错误;能作还原剂,C 项错误; 项错误。 答案:知在热的碱性溶液中,生如下反应:3=2。 在相同条件下 能发生类似的反应,其最终产物是 ( )AC D、解析:已知反应中氯元素的化合价:1 变为5