【導(dǎo)讀】Unit20Lesson4. 學(xué)習(xí)目標(biāo)。學(xué)習(xí)過(guò)程。課堂活動(dòng)。(一)預(yù)習(xí)交流。Discussion. 1.boundary. 2)barrier. 3)primitive. 4)permanent. 5)spin. (二)合作探究。WriteitDown.FirstReadingP26. ThirdReading. Task1.P26Ex4. (三)分層提高。SputnikI. SovietUnion. Telescope. Station. 1990. wateronthemoon. nowbeingbuilt. scientificbase. suchasDeepSpace. nowTosendcamerasto. tobesetuponthemoon. (四)總結(jié)歸納。(五)鞏固反饋。Finishtheexercise