Unit4 Astronomy: the science of star-Warming up & Reading教案

unit4 astronomy: the science of star-warming up & reading教案 

how life began on the earthstep one:  warming uptask 1: commom sense(常識) of science. physics, chemistry, biology（study of life),geology(地質學) and mathematics are science subjects. some science subjects will study two or more of these subjects, for example,the study of physics and mathematics is astronomy(天文學).                                                 can you understand the following combined science subjects.1.         physics +mathematics= astronomy2.         geology+physics = geophysics（地球物理學）3.         biology+chemistry=biochemistry(          ) /medicine(            )4.         geopolitics （地緣政治學）=_________+_________5.         bioengineering(_____________)=_____________+_______________task 2: common sense of biology------ study of the groups of life (生命的種類/物種)look at the pictures on the screen and judge the groups as quickly as you can.what is the most important condition for life to develop(grow)?(water, air---oxygen)step tw pre-readingthe world is like a big family. it’s wonderful and colorful because of different kinds of life living together.but how did life begin on the earth? the first question for scientists to answer is how water appeared on the earth?step three: readingtask1: fast-reading(para1) 1.         what is the important event(事件) to the earth before the appearance of water?2.         why is water important for the beginning of life?task2: sacnning (para1,2,3)    the beginning of water& the beginning of lifescan para1: the beginning of water1.the big bang       2.a cloud of dust  (combine into)   3.a ball/a solid shape  (explode)  4.water vapour, oxygen,…and other gas  (cool down)      5.waterscan para2,3: the beginning of life  (put them into right order)