一、第一节1—5 CACCA 6-7 BC

　　第二节8.He is hosting a programme./He is hosting Science in Our Life.9.Electricity in our bodies helps send messages.10.He will talk about the role of electricity in the humanbody and how we produce it

　　第三节Ahepers B.washing machines C.TVs D.lazier E.housework

　　二、第一节11-15 ABDAA 16.safety 17.power 18connect 19.battery 20.electricity

　　第二节21—25 CBADC 26—30 DADBA

　　三、31—35 CAADA 36—40 ABBCA

　　四、第一节41—45 BBDAA 46—50 ABBDC

　　第二节51—55 CABED

　　五、第一节56.apartment

　　57.Electricity

　　58.power

　　59.batteries

　　60.climate

　　第二节61.important to save

　　62.turning off electrical appliances

　　63.willrun outof

　　64.care about

　　65.join in

　　第三节66.It can help us do a lot of things

　　67.We should be careful wih electricity anduse it wisely

　　68.Don't turn on or off electrical appliances with wet hands

　　69.you must turn offthe power and ask your parents for help 70.We shouldn't use broken cables